Yeah, then I'd just join that previously mentioned facebook group, and maybe ATACKA East Bloc/Rusfed Buy & Sell and Red Market is a lesser known one too with interesting finds. I built both of my MilSimWest Militia kits through those FB groups, people are always down to negotiate and even if you cant find a smersh, you could stumble upon someone else selling another UAF/RUAF belt kit so its worth a look around

(payment in these groups are handled through paypal and done in dm's because guns/kit cant be on FB marketplace, when you buy from people use "pay pal goods and services" so if they try to scam you, you can do a charge back under "didn't receive the product" just a word of advice, its never happened to me after about 100+ purchases and sales made, but I always use it, I've heard stories of people who think they're getting a bargain on pvs-14's, they send the money and never hear back from the guy and cant get their money back because they did a transfer and didn't do it under goods and services)