Bad idea?

Make this a DIY project.  It's easy and you get a nice sense of accomplishment doing something for yourself?  Have a look at all the cable options at a place like 

https://www.vhaudio.com/search.html?ss360Query=speaker%20cable

Cheers.

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.