I haven't personally done radio advertising, so I would be interested to know how beneficial it actually is.

You may also want to consider joining a business networking group. I attended a BNI (business network international) meeting this past week and was very impressed with what seems to be a constant flow of referrals being passed around to the members in the group. There was someone in my group that did a similar business to yours and it seemed like she was benefiting greatly from being part of the group. Even if you don't want to foot the bill of 433 dollars for the first year, you can still check out a meeting up to 2 times before you have to pay. Their website is http://bni.com/ if you wanna check it out. Our business is in a bit of a dip, too so I was trying to think of ways to bring people in and this is something I'm gonna do and see how it works.