I ship in Bubbler for single cards that are Too Thick for PWE - Hand Sort Only. With me paying for shipping, a Bubbler shipped cost $3.70, thus in most cases. I lose money. I do these Auctions to Raise $$$ for a Homeless Ministry I work with. I purchase Gold or Silver with the Credits I win & proceeds go to the Homeless. I've done over 2600 auctions on Listia. Between this time and 3 years ago. All with 100% feedback and only a handful of issues with Handsort PWE. BUT, if card is too large, or if buyer wins multiples, or if single generally goes over 15,000 credits I send in bubble envelope. Hope this helps answer your question. God Bless