HBG operates like this… he buys multiple copies of the game(s)… like 1940 Europe/Pacific, 1942SE, etc… then breaks down the game pieces and sells them individually… he does this periodically… so one day you may notice he has zero British Infantry, but the next day he has 400 (cuz he just restocked multiple copies of the game).
If someone comes along and JUST buys a ton of Tan British units, but nobody buys any other units, then he’s unlikely to buy more copies of the game till the other nationalities start selling out… so ya, he might be out of Tan British for awhile if nobody is buying the other countries.
I’ve noticed obvious “well he just purchased a bunch of 1940 Europe editions” by how much stock of certain nations jump up… then usually a couple weeks later, bam… “well he just bought a bunch of 1940 Pacific editions”.
Just keep a “notify me when unit-x is in” tagged and you’ll get notified when he restocks… give it time, he will restock.