These were on sale last Black Friday for that price. All of the Black Friday stock (pallets of them) in the stores and all the online where Made in China.
The only way to get a made in the USA set was to not get one from the pallets of Black Friday stuff in the center isles. You had to go over to the regular tool section, then look in the back of the rack, and might get lucky and find a lone remaining, dusty, new old stock USA.
I went to three Sears stores on Black Friday, and did manage to find a single old stock USA version.
There may be some USA versions floating around, but after Black Friday I'm thinking most of the old stock USA was bought up.
P.S. You can quickly scan to identify the USA. The China boxes are more squared off around the edges, more of dark black plastic box, and have a flip latch to close. The USA boxes are more rounded off around the edges, more of a grey plastic box, and have a slide latch to close.