best interconnects sub 100

For used look for a pair of Nordost Blue Heaven. I also highly recommend cables made by Stu Wein in Florida. He use to make the high end digital cable that came standard with Wadia DACs. The brand name is MAS (Music and Sound). His Silver "Grey" cable is around $75 a pair and will compare favorably with the Blue Heaven. (I have a couple pairs). Stu can be found a Audioparts@aol.com or 561-642-4103 Stu also makes some nice power cords.

Used Audioquest Emerald or Opal.

Cheap is subjective. You can get good and cheap at Radio Shack. What is your budget? There are alot of stores off-loading their old Audioquest (Topaz, Jade, etc) at about 40% off retail if you call around. There is also a DIY guy on Ebay who sells good cables anywhere from $30.00 for PBJ look/perform alikes to $80.00 for look/perform alikes Heros'. If you go to Ebay search on Cableplex. I have 4 of his PCs. At $50.00 per, you can't beat 'em.
Happy hunting!

I've had good luck in my younger years with Kimber Hero, depening how short you need them to be it may be an option. Good luck!

Music Metre is sold/auctioned on this site for around your price. I replaced my PBJs and Tributaries Silvers with the M.M. Silvers and was stunned by the difference.