If you are looking for a credit card processor, I think it would be worth your while to get a free quote from this company as I found them to be very competative and willing to offer a very good deal to Signs101 members, however these things change all the time so a quick call for a current quote is the best idea:
http://www.signs101.com/forums/showthread.php?t=68070
http://www.signs101.com/forums/showthread.php?t=68070