Bad idea?

There are lots of good cables out there, used, in different lengths and well under your budget...

I've been both impressed and happy with this brand for several years now. They aren't just another pretty face.

https://www.amazon.com/dp/B06XC3TNLL/?coliid=I8WET0SEDPLP6&colid=1WNVYP81QS4DC&ref_=list_c_wl_lv_ov_lig_dp_it&th=1

Check Blue Jeans Cables

Another vote for Blue Jeans cable.  Also Pine Tree Audio.  Both will make cables to length at a reasonable price in the US.  

Roger Russell's yap about speaker wire

http://www.roger-russell.com/wire/wire.htm

I like connectors from Parts Express, no solder, a pair of set screws

Solderless Tightening Bananas

Similar solderless, Spade Connectors

Personally, I won't spend money on speaker cables, I make my own out of twisting a pair of ethernet cables (cat 5,6,7,8 doesn't matter). Look for pure copper, look for smaller number/higher awg, I prefer stranded to solid, I wrap/tape two different colors so I know +/- each end. Cut off the factory connectors if any, attach solderless connectors from Parts Express.

Combined Wire Gauge Calculator

i.e. 8 strands of awg 22 = 13 awg

i.e. 8 strands of awg 26 = 17 awg