Higher end value cables

I have a First Watt M2 (25 watts Class A no feedback) & Croft Micro 25 (tube preamp), but that's no guarantee what works for me would work in your system.  Nonetheless, here's a couple of cheaper Cardas options:

Cardas Crosslink (slightly warm)
https://www.ebay.com/itm/CARDAS-CROSSLINK-1I-RCA-to-RCA-Stereo-Interconnects-by-Corpse-Cable-1-5ft/3...

KAB / CARDAS "SpiralAir" All Litz Coax  (more neutral, at least with the Eichmann bullets)
https://www.kabusa.com/frameset.htm?/

For used products, 
 https://www.hifishark.com/
allows you to search multiple sites at once (including Audiogon).

Everybody has their own favorite.  I went with DH Labs silver Sonic BL-1 some time ago.  They work well for me, I diy speakers and cables and wanted something affordable that passed the signal fairly neutral and these fit the bill.  Wires are like french fries, there are a lot of good ones and some not so good but in there somewhere is your favorite.

How bout you list your gear/system details?

Find the replies to your query a bit odd considering that you have not done so.

DeKay

DH labs look pretty good. Not sure what you mean by system details dekay, but I listed my system above. Thanks

+1 for DH Labs cables on a budget for sure.
Used them myself before upgrading.
One way to get a lot more cable for your money though is once you have semi decided what you might like to buy, go look for them used here or on eBay.
That way you get  a lot more bang for your buck.

For example if you had a budget of 125 for a pair of interconnects you most likely will get a used pair that originaly cost at least 250 for your 125.
And they should be nicely broken in to boot!

I have only ever bought one new pair of speaker cables in my life, and they ended up being returned...lol.
All my cables and subsequent upgrades have all been purchased used but not abused!

Good luck and welcome to the ever maddening group of "cableguys"