Have you thought about cotacting Mark at www.freetalklive.com ? They might have some kind of radio commercial production deal.

Here is why I ask, because to have a professional commercial made, it would set u back about $1000 ish. But maybe Free talk live can produce a commercial for you (and you own the rights to the commerical) if you buy commercial spots on their program. A.K.A every once of you budget goes to on air play time.