You're in the right place. People here will help guide you to a decent short bus. If you've got some time to wait a few months there should be an increase in bus sales as the school year ends.
Watch the "Nonaffiliated buses for sale thread." You'll learn a lot in a short amount of time, and you may find something there that you like.
Everyone will want to know what your preferences are for your short bus. "East Coast CB" is probably your best bus advisor in FL. Lots of FL people on here, but ECCB has got a good eye for sizing up a bus.
Nobody here will knowingly bid on buses you're interested in, because most of us already have one or more buses. Please post links of buses you're considering and folks here will evaluate them for you. At times you can even get help on buses that are far away from people that live close enough to actually lay eyes on the bus you're considering.
Good luck and have fun.