Ok here is the cheapest pack n play I can find in a store
Walmart.com: Cosco - Funsport Portable Playard, Serengeti: Gear
But baby resale shops always have these and it will be way cheaper and I think your going to need the sling too
I spoke with my vet again. He says that Serdy is the most meticulous surgeon in california and he would drive the couple hours for him if it were his dog. He hasnt heard of the 2 you mentioned but he said he will ask around at his vet conference next weekend but they is probably to far out
He said he would go into something and look at there credentials and get back to me.