I recently ordered ~$100 of cables from Monoprice and paid $20 for shipping (even though I have prime!) because I don’t trust Amazon. Really, Monoprice wins on discovery too. They offer one of everything at a good price.
Wow, how did your 3,918 cables arrive? Was it a full-sized goods truck or a couple of crates?
(This is, for the unaware, a joke on how inexpensive-yet-still-excellent Monoprice's cables are. Every time I order a clutch of Ethernet or USB cables, I wind up ordering three times as many just to make the order total greater than the shipping total and to have spares for later use.)
OTOH, fancy RCA cables sell for next to nothing at thrift shops now.