Weddingbee boards

So I am like the thousand other brides who loves the idea of using a camera, markers and a Kolo guest book for their wedding.  I know I can do the typical old school polaroid camera, but because they are not making them anymore, they are a little spendy.  Does anyone have a suggestion or two to keep the concept of a picture guestbook, by not using an old school polaroid camera?  I have looked into the newer spit-out Polaroid cameras, but I dont know how reliable those are, since its newer technology.  I want to take a picture at the wedding and have a copy of that picture out on the table for the guests within a minute ot two.  Any suggestions??