Ask your friends, family members and people they know to help. (investment early on behalf thier time may pay off with a compesation or ownership plan you may offer in the future).

Advertise on a college billboard or hand out cards at a campus. (Many will do free work just for the experience, or the possibility of them working thier way into ownership somewhere down the road).

Put cards on car windows (least preferred, but you did say "quick").

Advertise in local papers and classifieds (fairly cost effective).

Hope this helps some.