Don't mean to discourage you but I too, have been looking for these and got so frustrated after months of needing them that I just bought them new. It wasn't too bad either since ME doesn't charge much for shipping - $3 is pennies.
When pp are asking $10 here plus shipping and you want more than 4, the shipping is so disgusting that you will have either broken even by getting them new or paid a few dollars less. These are heavy and way bigger than the smalls (I was surprised.) Especially shipping within Canada. From me in Ontario to you in Sask? Pff. It's cheaper to send to the States. Seriously, I'd just cave and get them new like I did. I may do the same with the $30 bedwetter pants pp are selling for $20 +sh here. $30 new, $3 shipping and I can get more with the money I'd spend on shipping, kwim?