We filmed my daughters prescreens at my gym. We used a small yoga/pilates room when there were no classes scheduled. I used a video recorder that was 6 years old. I recorded everything. We also edited everything. It honestly was not that difficult. We used my daughters iPhone on a nice dock for her music. It honestly turned out great. You absolutely do not need to spend a ton of money for the prescreens. As long as they can hear you clearly, and the acoustics are good, you will be fine.
We stressed about getting the prescreens done, but did not have enough $$ in the budget to get something done professionally. So we had to tackle it ourselves. We also made a fun “bloopers” video! LOL