The best place to look for them are at the check out lines of Walmart. Thats where they stock the short card HW's. The BM is also out in the new 10 packs at Wally and Target, but $10 is high if all you are after is the BM. I believe the BM is also hitting the Target 2-packs at the check out lanes, but not 100% sure.
I saw a couple today at the WM check out lane, passed on them. I have seen a bunch in the 10 packs. I bought a total of six BM's, kept one, customized two (if you haven't heard ) and gave the others away. I have probably passed on 20 of them.
Like I have said before, hold you horses, they are gonna be peg warmers soon. They still have only been out for about 3 - 4 months.
SOWTH, that variant treasure hunt you found is called a Super Hunt (if the S in treasure and hunts are a $ or has nice rims, not just mainline rims). The regular hunt this year is one per case. The Super Hunts are about one per 4 or 5 cases, Nice Find!