monoprice.com is cheap. i can't vouch for their quality though. i bought a component cable from them and it looked horrible. i've seen some for $60 that extend and tilt on their site, those are $300 retail, worth a shot.
Mono price ones work fine. I have bought tons from them and they all are great. The cables may not be as pretty as monster cables but they work just the same for a fraction. Same with the wall mounts.