Thanks for your input. I will definitely explore the options you suggested.
Wayne, when you say it is hard to get wireless system for less than $300, do you mean just the microphones?
I might be able to get my boss to spend upto a $1000 on the system, provided I can show that I have done sufficient research on the equipment. Given a thousand dollars are there complete (mics, mixer board) systems per my spec that meet this criteria? If not, I may have to go with rental equipment, at least for this summer's workshop.
We would like to do more of recording and putting the content online with future workshops so purchasing the equipment would be preferrable. But, this coming workshop will be the experiment that either proves or disproves that we have the technical know-how and tools within our existing group to continue doing this in the future. So, I am trying to learn as much as I can and I really appreciate you all helping me in this effort.