I visit a well established Local Coin Shop, in a busy part of town, about once a week. Platinum coins are very, very rare, there. In the last year, I can only remember, seeing Platinum coins, three or four times. His prices, were hundreds of dollars less than, his fairly priced gold. No, I own Platinum. Can't afford it. But would, if I had the money.
Thanks for sharing. I expect that is probably a pretty common situation with Platinum being nowhere near as popular as Gold and Silver among stackers and collectors so it's probably not worth stocking for most coin shops.