personally id go the snap on one, ive used others at work and dont trust them, feel like they are going to slip and round it out
but if not try toolexpress

I found mine at Toolmart after the sales guy said they don't have any. Paid $20 from memory, fits good, never slips. I think it's an ABW brand.

Plenty of places still use chisels on them, I see the marks on the drains all the time.