Hi 
Am looking for something that will last until adulthood (if they don't destroy it first  ;) ) and was about to purchase a 42 inch when someone mentioned to me that a 36 inch would be the way to go. I have seen both sizes and I thought the 36 inch looked a bit squishy    Just to be clear these are the collapsible home crates I am talking about, not the travel ones. Help?? 
Also are the ones that you find on Ebay/Deals2you etc. any good?  They look exactly the same as the ones in Pet Barn but are about a third of the price....? Anyone bought/used one before and if so how did they hold up? 
Thanks in advance 
Kellie