I'll jump on the Monoprice bandwagon. I've purchased hundreds of dollars of cables and parts at Monoprice....so that's a lot of cables. I've never had a single issue with any of them, except one set of premium component cables was way too rigid to work with in my space constraint.
You name it, I've purchased from there: HDMI, RCA, subwoofer, component, mounts, wire ties, banana plugs, wall plates, 3.5mm, usb extension, USB chargers, etc. They all work and were all dirt cheap.
System Components: Custom Silverstone/i5/SDD/16gB/GTX1080 HTPC Denon X6200W in 5.2.4 Emotiva XPA-7 Gen 2 2 x Paradigm Studio 100 V3 Paradigm Studio CC-570 V3 2 x Paradigm Studio 40 V3 4 x Paradigm AMS-100 Ceiling 2 x Paradigm Seismic 12