DarkishStar
Is it wiser to start out cheaper?
If you aren't confident of your skill, then yeah, start off at $5 or so. I won't recommend going too low either. Because $5 is cheap as it is, if people aren't even willing to spend that amount, then they probably won't bother to buy at even lower price either. Of course that's entirely up to you. Only thing is don't adjust price in the middle of a con, that would make customers unhappy.
fanartist: Good idea. Here are the sites I've used, I plan to try out bestcolorphoto.com and ezprints.com soon.
I personally love
mpix for their special metallic finish. And they are for professional photographer and artists, so I won't doubt their quality. Price is reasonable.
deviantArt is really good too, stays pretty true to the original color. Though that'd depends on how your monitor is adjusted.
snapfish is so so. They adjust the print settings and the print is more saturated than it should be, which is not very true to the original color. Which is not preferred to artists.
cafepress their postcard's print quality is kind of mediocre, I can see the dots printed. But their poster print quality is pretty good. Though their price is a lot higher compare to the other one.
zazzle don't use them. I actually haven't purchased any print from them, but it's a pain to cancel your product. -___-; I don't like other sites have my original high res picture most time, and not able to delete your product is really shady business practice. Their price is not cheap either.
OfficeMax and
Kinko all depend on the staff and which location. Some location branch have better printers and better staffs, some don't. So it's really hard to say.