I use lots of Promo - the Alliant "equivalent" to Promo.
One of the surplus powder suppliers (Redeye reloading) is selling a MP-35 powder they claim is about the same, but at around 10% less given that they include shipping and hazmat ($200 for 16 lbs).
Note that they also seem to be stocked back up with all of the "regular" milsurps including H335 and BLC2 equivalents.
https://redeyereloading.com/?product...t_type=product
6/15/20 edit: The red text above does not match what I found after some of the initial responses. It looks like I just read it wrong. I now see it at $200 for 8 lbs. I do not see how they can expect to sell an equivalent at this price given that PV has Red dot at $149.34 for 8 lbs and Promo at $126.36 for 8 lbs)