Depends on how many of certain r99s or retired cards people are selling. If no one is selling and you make a board trying to buy a certain card, people will ask for over 20m on a single rare card. But if more r99s or retired cards pop out from people who decide to sell their deck (or from the attic), then prices decrease for a short period of time.
---------- Post added at 11:21 AM ---------- Previous post was at 11:20 AM ----------
I know of a specific account where someone sold all of the unbuyable cards for MSPP + BGC + 2x Thigl + Ari. That was when decks were popular and people were not lending the shit out as much (back in May). So the price probably decreased since that sale.
While NeoDeck cards are pretty HTS (on neo for np) individually, I've never seen anyone selling or buying a complete deck as a set, so I'd recommend breaking them up and selling them individually instead of all together. If you're selling them on here, though, may as well go all together because who would buy a single neodeck card illegit?