IMHO, the best TRU Thursday buy remains Birds 21301. I really am a fan of this set. With the TRUTH discount, cost is just under $40. The few times this wasn't stocked by Amazon Prime, it was a nearly $70 set, and it should go away sometime this fall. Bank on this going above $100 shortly after EOL, and I think $200 is possible on this one within 18 months. Easy to store and ship as well. 3-5X MSRP possible on this set, and I don't see a downside; it will never sell for below MSRP.
*one other data point. The Lego Employee-exclusive xmas set this year was also a Birds collection. That sold easily in the $250-$300+ range (I recall a few $400+ sales early one). While the Lego employee exclusives always command a premium, this one was quite a bit above the norm. I think this was driven in part by the theme, which has huge AFOL and even non-AFOL appeal.