I have patience to wait, and hands on to build my own, so China epacks, Aliexpress are terrific sources for me for items or parts, wire, cables, I might cut the ends off .....
After choosing an item I want, i.e. Cat 8, 6 nines copper I used to make speaker cables ... especially Aliexpress, I learned to pay attention to the shipping cost, that can make more difference than the item's cost.
If already paying some shipping, rather than get just what you need, find the same thing but in a package with a few spares, i.e. gold plated parts: adapters, banana plugs, ...
Interconnects with locking RCA connectors, waiting now for XLR/locking RCA 6 nines copper. Always as advertised, always sound great.