Search and then pick US only for US suppliers.? They usually charge more. But you will get them in a few day or week.
Order 1 from them, 5 from China.
I usually see a month on the ones that predict 2 months.? They don't want bad feedback because of shipping that they can't control?
Also, I have used the "Mini Pro", it is cheaper, but you have to buy a serial programmer board.? They do not have the USB connector.
Probably not worth it, as cheap as Nano has become?
Mike, WA6ISP