"Great RCA interconnects under $100?"

DH Labs is great stuff for the money, I've also had good luck with Goertz Micropurl. I'd buy used for sure but chances are you'll need to look elswhere, sub $100 items don't show up all that often here on the 'Gon due to the listing fee. Happy listening, Jeff

i second the ic-3, in my system they outperformed the signal analog 2 and silver resolution.

Excuse me, I have to do this... I can get an amp for $500, so why would anyone spend any more than that? Sorry, hahahaha.
Okay, now for disclosure. I make AweSound cables. I think mine are the best sounding of any of the Audiogon (not yet in a big store) cables. I sell a cable for $90 a meter, that is a gold plated silver. I know they can be whooped by $1000 a meter cable. But they are good, my Audiogon price for cables that beat the $1000 a meter retail is $149.
I say yes, you can! Okay, so other than my subjectivity, how about Audio Metallurgy, they can be had for under $100 new often, and under a meter very often under $80. (like a .75M).
The Monster retro Gold is about the only thing I've recommend from them.

Kimber PBJ - one of the most neutral cables I have ever used.

Marco; water and jeans are a commodity. HiFi audio equipment is not; apples and oranges. Of course one can get ICs for < $100. Just like anyone can buy a watch for < $100. The question is, if taken verbatim: do GREAT cables exist for <$100. No.