These mini PCs have been having long lead times in the US. Same thing happened last year - placeholders at several vendors with a price, but no estimated ship time. Was the same with Intel, Asus, Gigabyte, etc. Just couldn't get them. Even heard from one of the vendors I talked to that even Intel employees couldn't get 11th gen NUCs last summer.
I needed a couple so I ended up having to order them from the UK as they just weren't available here. The price was pretty good too - better than the ones in the US that claimed to have them. Just make sure to use your CC's conversion rate as Paypal will screw you. The good news is the vendor was great to work with - very easy process. They shipped it on a Thursday and it was on my doorstep Monday - quicker than getting it from the west coast by ground (live on east coast). Shipped with US power cords too.
If you need one and can't find them here, don't be afraid to look across the pond.