Try this place:
http://www.airbrushcity.com/comp45/
Remember that the more you spend, the less you'll have to replace in the future.
Any compressor can be made to be compatible. I would go for the 114AC at $117 just for the auto shut off. Running a small compressor constantly will drastically shorten the life. I would also recommend spending a bit more and getting a tanked compressor, but you know your budget best.