What's the average cost to develop a plugin?

I know that's a nearly impossible question to answer, but I need help getting the quickpress-for-buddypress plugin to work (or replicate its functionality in a new plug-in).

I'd like to post this in the WPMU jobs section, but I'm not exactly sure of a budget to post. I'm not looking to insult people with the $100 method, but also can't spend thousands.

Any advice/direction would be appreciated.
Thanks.