Which inexpensive speaker cables...

I’m a big fan of Blue Jeans Cables. They have several types of cables to choose from, they make to order so custom lengths are not a problem, the locking banana clips they use are genius. They ship out quickly and use second day FedEx.  I’ve had a couple of conversations with them and you talk to the owner.  Excellent product Excellent service and real world pricing. 
Don’t forget to check out how they ultra sonically weld the cable to the connector. 
https://www.bluejeanscable.com/?srsltid=AfmBOoq8SFE3KyT2qwB4aUXfAJ_YwQniTAw8Kx_7GkGspxESHLHWnQZu

laugh if you must, but I bought 12 and 14ga. speaker wire from KnuKonceptz Karma.com It’s Twisted oxygen free copper wires in a clear tubing Cheap,Cheap, Cheap. Great sound could not believe the difference they made. I have Mcintosh tube preamp and a Mc452 power amp with Cornwall4s speakers I have not heard anything better. For under 50$ you can’t go wrong. If you don’t like them I think they take returns . My interconnects I spend 1500.hundred on and I still stuck with their cheap speaker wire.And BTW I have no affiliation to this company.

Best inexpensive cable-Belden digital SPDIF cable.  Used until I receive my Westminster Labs Ultra carbon fiber AES cable.  $25 for a true 75 ohm cable.  I've also used Belden XLRs previously on EAR equipment.  My friend and I can vouch for the digital cable though.  Used on Shanling ET3, Jay's Audio CDt3 Mk3 to Topping D70s and Lampizator Poseidon.  A true bargain.  At 12X the price, Grover Huffman all silver SPDIF cable.  Also Grover Huffman power, phono and speaker cables are high end at a much reduced price despite not being SOTA.  Those Masterbuilt Ultras and Westminster Labs Ultras are mucho dinero, best on high end and SOTA equipment.