50 foot cables?


Hi, I need two 50 foot cables for my stereo. (Amp is Rogue Tempest tube and speakers are Audio Physic sparks.) Does anyone have recommendations for something affordable? Ideally less than $500, if thats feasible.
Thanks a lot!
ineedhelpwithcables
+1 Miller. 
However, I would do everything possible to knock down the length of those speaker cables. Even 25 feet long is crazy and IMO probably will have some negative sonic effect.

Thanks, and if it turns out he only needs 25 feet just coil the rest and pile it in with the rest behind the rack. It can't make any difference. stereo5 said so, and he has 50K of equipment. 
Post removed 
@millercarbon,

learn how to read, I know it is hard but you can do it.  Please show me where I said to coil the rest of the wire.  I’m waiting..................
I moved my speakers next to my amp and tried 5 foot cables and trust me, there was no difference between them and the 25 foot pair of the same cable.
 
No difference between 5 and 25 feet. So how could there be any between 25 and 50?