I bought the epson printer and food grade ink and I print my own. I just use whatever I already have (ie powerpoint, word or a picture). I got it the printer from epson and the ink and paper from KopyKake.com. They have a program but everytime I tryied to used it it pinted off center (NOT COOL) so I just quit that. Hope this helps.
I am a home baker and I use edible images all the time. I usually print the messages on my cakes using edible images. They are a lifesaver for me because I haven't mastered writing with icing. Check out some of the cakes in my photos. I have a scanner and a printer I use exclusively for images. You have to use edible ink in it and it can't be used for anything else. The model I have is the Canon PIXMA iP3000. I would recommend it. I get all of my ink and frosting sheets from Icing Images. Here is the link: http://www.icingimages.com/info.php. I recommend the LUCKS brand frosting sheets. They work the best for me. There is a good tutorial on this site for using edible images. The link for that is http://www.cakecentral.com/article59-Edible-Images-Chapter-1---The-Basics.html. I hope this helps. Good luck!! 
I have the Canon Pixma IP 3000 printer and love it. I bought it off of Newegg for $60, and just gave away the inks that came with it. I buy my inks from PhotoFrost and use the Luck's frosting sheets. I've tried the wafer paper and didn't like that at all. However, they are good for butterflies. Just make sure and keep the inks in a Ziploc bag until ready to use and put them back in the bag after you are done. I just print the images on occasion, and I don't want the ink to dry out in the printer. Also make sure the keep the frosting sheets zipped up too in the resealable bag they come in. I just can't see spending the money on all of those edible image print systems when it's just as easy to do it yourself. 
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