I needed a few and it seems to be out of stock everywhere. I tried eBay (USA sellers only) and the 3 I bought from, they refunded me later due to out of stock. I guess they were drop shipping and didn't keep track of the source's stock.
Is there any available in USA that isn't $5 per chip? $5 is when I get cheap Nano and remove the chip.
EDIT: I looked at VQFN version, it's much smaller with narrower pin spacing, I would have to run a bunch of bodge wires to connect VQFN to TQFP pad.