I often purchase eBay lots of unused (full gum) Canadian stamps which I then use for postage. I usually purchase such lots for about 65-70% of the stamps' face value.
A listing from a seller from China caught my eye. This seller is offering brand new rolls of 100 'P' stamps for C$23.13
After 'watching' the listing, the seller sent me an offer for 500 'P' stamps for C$86.71 plus C$8.15 shipping. (500 times 92 cents is $460, so including shipping the offer amounts to less than 21% of the stamps' face value).
I strongly suspect these are...ummm....self-produced stamps. To the Canadian stamp dealers on here: Is there any chance this is legit?