Through October 21 Hilton HHonors is running bonus on purchased Hilton points.
Hilton usually charges a penny apiece for points, so with this bonus is selling points for half a cent each. That’s tied for the cheapest I’ve ever seen (in June 2015 they offered a 100% bonus on purchased points also, and a few months back they ran 50% off). They’re selling points for just about what they’re worth.