Computer Scrapbooking Techniques

It depends on how many you need. Any more than 50 and I'd say have them printed.
Don't be fooled though- the paper isn't cheap and neither is the printer ink. And don't forget you might waste some due to jams or smears.
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If you are on a tight budget, then why not? I have always preferred the engraved invitations, but these days, not too many people know — or care — about the difference. It's silly to go broke over paper.
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I've made my own invitations and so have other people I know.saving money on invitations is a great idea. most craft stores carry beautiful embossed paper made just for weddings, just print with a pretty script font and they look great! walmart has less expensive but still very cute options, too. target carry's middle price options. realistically most invitation end up in the trash after the wedding anyway (most guest don't keep them) good luck!!!
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http://www.michaels.com/art/online/displayProductPage?productNum=wd0213

Michael's has card kits. Or you could browse down the scrap booking isle. They have so many things there and Sundays are 40% off most items. Some of my friends have made their own and they were very nice (and cute!)
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I made my own invitations.
First I looked in the wedding invitation stationary catalogs for ideas and inspiration, like lay outs, paper types, fonts, and font colors.Then I went to the craft store and bought the paper. A lot of places will have different types of stationary just for invitations. I found a really nice formal one, and bought ribbon to dress them up. Don't buy the ones with the ribbon included. You can get way more invitations for the price of the plain ones and buy a whole roll of ribbon and add them yourself.
Next I searched the internet for different ways to set up my invitations (wording), as far as introducing you and your fiance (are you hosting the wedding or your parents), parents(son of…daughter of…), time, place, date, ect. There are 100's out there from traditioanl and formal, to kick off your shoes and walk in the sand with us. Also you find set ups to deal with divorced, deceased and step parents. The wording was the hardest. I combined a couple of styles because we paid for our own wedding(hosted) but wanted to introduce our parents(traditional). Just be careful when you print. I made a tiny little error and had to toss about 100 printed invitations!! If you choose a color for your font run a couple test runs to make sure the ink is callibrated. You don't want streaky invitations. I printed all of my invitations at home and guests where shocked when i told them i made my invites at home!
As a special touch i bought a pack of vellum paper and cut them the size of my invitations and placed them in the envelope before i sealed them.
As far as addressing them, I bought the clear address stickers, typed them out in the font that matched my invitations and stuck them on the main envelope, and return envelopes. Very neat and much faster than hand writing them, but less traditional. Oh well, guests toss that envelope in the garbage anyhow!!
Good luck. You are going to save hundreds!!!!
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Treasure Masters has these great invitation kits, i used them and they turned out wonderful so many people who got them thought that they were done professionally and they were pretty cheap you can get them from a office supply store near you.
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Your easiest bet is to try to do what we did.

We bought a simple silver double heart design invites from target for less than .50 cents each for invites, reply cards, envelopes, et. et. We printed them out using their software on a home computer and regular printer. To cut down on ink costs and postage costs we made an "online" RSVP with back up phone numbers for the less technologically advanced. It was easy and we did it in one afternoon. You can even print out the addresses on envelopes with this program included in the invitation set.

It made our job simple, easy and very cheap.
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I made my own and saved loads of money by doing so. If you make the design simple enough and create the text on your computer it is easy enough. Check out the site below for some ideas. I would buy some heavy good quality card stock and envelopes to match. Purchase a simple stamp and some appropriate ink and stamp the image on the front. Decorate with some sheer organza ribbon for a simple but effective invitation.
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http://www.creating-invitations.com