The product sounds very interesting. You seem to have made a typo in your budget though. You are asking for somebody who doesn't live in their parents' basement. You also want ongoing support and testing after installation. If you really wanted those two things, you would be offering enough money to enable that. At minimum you're talking about a week's commitment for somebody who does drop off the script and abandone you, and realistically you want some attention for at least a month, probably with another month of tweaking. Unfortunately the local burger joint is paying better wages for a week's work.
If you want somebody who doesn't live in their parents' basement, and won't disappear as soon as they cash your check and deliver the code (in that order), you'd better pay enough money for them to move out of that basement. Figure out what you monthly house, car, electric, phone and internet bills are. If you're not willing to offer that for two weeks work, you aren't in the market for custom programming. That's because the programmer has those same bills. He also has to cover a lot of other things, like health insurance and retirement.