What a bargain!
https://singer-featherweight.com/search?q=301+bobbins
I bought my bobbins, FMQ foot and replacement bobbin winder tire from Aprils1930sshoppe which is now The Featherweight Shop. If you like a lot of bobbins, I'd purchase the ten pack of repros and a three pack of original ones. My machine seems to like originals for FMQ and reproduction ones for anything else.