Burk,
They are hard to come by used & in Good condition.
The ones at Sam's Club for $199 are the best quality ones and hold up the best.
After Thanksgiving sales, check Smart & Final. They have a decent 10 X 12 one that we have bought a few times. It's not built great like the Sam's club one, but I think we got it for $89 at the After Thanksgiving sale. Also, it did NOT come with Side Walls where the one at Sam's club did.
Not sure if that helps you at all, but just some thoughts..