There are hardware stores, and then there are places that supply tools to the manufacturing industry. The latter has things like keys to a Jacobs taper 33 chuck in stock - and a $25 minimum order, and ordering techniques that haven't changed since the early 80s. Involving paperwork.
So I bought two chucks and a carbide-tipped scribe for work. Minor inconvenience for precise stuff on demand. n.n (Once I just bought $25 of hacksaw blades. They're good blades, Bront...)