At Natchez, the only place I've seen it recently. If you buy $99.99 of powder/primer, the hazmat fee is waived with code FH180125, which is good until midnight tonight. I picked up some powder and figured I'd pass it along since I know there's some who've been looking to try it:

https://www.natchezss.com/alliant-powder-reloader-26-powder-1-lbs.html