recommendation for best low cost rca interconnect

Try silent audio apollo c copper rca cables. If you need a short length (<1m) Paul will make them up to order at a very reasonable price if you can't find the length you want on his audiogon auctions.

Best value: MAS Black, used $40.00 or the new Auricle Audio Ka,new,$30.00-$50.00, depending on the auction here on Audiogon.

Try audiopartsinc.com

Good products, especially for the money.

Paradoxically, if your new best low cost IC delivers all that an inexpensive player is capable of into a great amp and speakers then you may find more CD's don't sound as natural as with a more expensive player which better tames the digital medium before sending its output into the rest of your system.
To hear all that your player can deliver at your maximum $150 budget point there is the wonderful Realitycables.com original RCA IC which can even be pushed to somewhat more amazing capability with OFC RCA connectors at the $225 price point, still affordable for a rather supreme level of performance.
Since these are at home in expensive systems, you will be hearing all that your player can deliver, and be ready to transmit what an even better player can deliver when you eventually choose one.
I have not recently spotted Auricle Audio Design IC's for auction or sale here on Audiogon, but still recommend keeping an eye out for such an ad. This vendor impresses me as providing the best performance for a given low auction price. Despite a bargain price, you can enjoy shockingly good detail and transparency. Although your setup does not require a digital IC between separate CD transport and DAC, if that should be in your future then be sure to remember this source for a mind-boggling digital IC.

Kimber Kable PBJ or DH Labs BL-1.