months?

My 15 and 13 yo sons are collecting basketball cards. We bought retail boxes at Target for $20 apiece back in January, that are now selling for 5 times or more of the purchase price. We cleaned out one Target, and bought 19 retail boxes, and 3 mega boxes (which retail for $50). The mega boxes are now selling for around $250 apiece. The little rack packs that retail for $9.99 are selling for $50 apiece.

I know Zion and Ja are a big deal, but this is nuts.