Couldn't find any threads on this.
I stopped by the Tyson's Galleria Men's J Crew (Northern Virginia) shop this afternoon to donate some old jeans (does not need to be J Crew branded) to get $20 off a new pair of jeans. My wife's amex card also had a promo for spend $100 get $20 back, so I threw in a shirt for $19.50. The guy rings me up and says that the $20 denim donation is $20 for each item so my total was only $83 after tax. I asked him to wait and got another shirt and then another button down shirt. Theoretically I could have gotten even more shirts for free as long as they were under $20. He made it sound like it was a promo, but no idea if this was a system glitch or not. In the picture the amounts in the 'Amount' column are giving incorrect values (it seems to be spreading the discounted amount between the four items I purchased) but if you manually take the price and the negative amounts you get to the same total.
TLDR: Donate any jeans, buy jeans from J Crew (in store only) get $20 off the jeans and every other item you add. Free T-shirts (at least the V necks as those were $19.50).
Has anyone else been able to get in on this?