Lowe's in Concord, CA, had plenty of stock at $5, not the even cheaper $2 price.
They had one individual tray of the original Taiwanese variety, which is different from the 3 piece Chinese made sets. Apart from the Chinese ones having lower height spikes, they do not appear any worse in quality. They look injection moulded, as they've got ejector pin marks on the back.
I grabbed a set of each, so should be good for the rest of my life now.