The stamps sold on the Classic Latin America website are not promoted on eBay/HipStamp. Likewise, the stamps on eBay/HipStamp are exclusive to those channels. In general, the eBay/HipStamp stock tends to be quality, lower value material plus auction lots but there is no strict delineation. Note that the stock on HipStamp is identical to the stock on eBay, so you don't need to search both sites.