My Mi Box 4K bricked somehow the other day, so I figured it was as good a time as any to pick up an Nvidia Shield. I brought the Mi Bix with me, intending to just toss it in the recycle bin in the front of the store. Luckily I didn't do it right away, because there was a sign next to the Shield display for $30 off if you give them any other player to recycle.
They took my Mi Box without question, even though they don't stock it.
Edit: [Here] ( https://www.bestbuy.com/site/promo/nvidia-shield-in-store-offer ) is the link to the info at Best Buy. Looks like it ends on 11 Aug.
It was a better deal a couple weeks ago when the Shield, remote and controller were $179 before the trade in.