I have a Jeep wrangler and am looking for an amp to power 4 speakers, that has a small footprint (I am looking at mounting it beneath the drivers side seat), but is hopefully economical, does this amp exist or is it just a figment of my imagination. If anyone has any ideas please let me know.

how small of a footprint are you looking for? also, how much power are you wanting? a good place to look would be here http://www.crutchfield.com/cgi-bin/S-9hLfTsbmqGU/ProdGroup.asp?c=3&s=0&g=120 they tell the diminsions for each amp they sell in the description

You might consider Blaupunkt's PA4100. It's rated 4x100 W and its external dimensions are 10 x 2.6 x 9 inches.
Problem is it's not exactly cheap... But you might find it somewhere in the net chaper than in Crutchfield, where it's priced at $429.95 .
Good Luck.