I ended up selling the last of my extra copies New Year's Eve.
Average purchase price for me with tax was just under $18 (let's call it $18 even with gas/time) thanks to that little bonus "B1G1 40% off all video games $19.99 and under" deal from TRU when they were $19.99 each. When they had that deal, I just combined it with the previous B2G $25 GC to bring the price down even more (although I had paid $30 each + tax for the initial 2 copies to get the $25 giftcard), and was amazed when I got them to combine both the $19.99 sale price and the B1G140% off. After release day at TRU when they told me somebody bought out all 20+ copies of the game at 1 TRU, I didn't hesitate when I found them in stock.
I've cleared a little under $50 a copy after all is said and done, sold around $75-$80 average.
BTW they actually fit in the small flat rate $4.95 USPS priority folding box, I just had to adjust the folds on the priority boxes slightly to make them fit, and not seal them with the internal glue seal but rather tape them shut.