Joe, there's no reason to be so nasty about it.
OP, to start off, I'd probably just wear what you've got and ask them what would work best when you get to the lesson (they might say that your current shoes are fine). Also, I might have missed it, but are you riding western or english? I don't know about english, but you can get a pair of functional but cheap western boots new for $50-$60. Personally, I prefer to go a bit more expensive for the comfort of my feet, but not everyone does (or is able to).