Yes you do have something to lose besides $200 -- more money in vet and/or farrier care, or disposal cost somewhere in the near future; your own safety; other people's safety or paying for the upkeep of a horse that you can't ride for whatever reason.
I have taken all my horses without PPEs, but I was fully aware of the risks I was taking and in a position to do that. You aren't, so I agree - take a vet with you. Maybe your parents will advance the money for that for a month for you or the vet will take payment in 30 days. And DON'T buy him just because the lady is meeting you and you feel like you have an obligation to take him since the arrangements have been made.