Inexpensive Tri-Wire Cables

Triwire and biwire all can be done with separate wires and/or cables the following cheap and great way:
order a 12AWG silverplated Carol Command wire from www.partsexpress.com.
That's the wire used in the studios. Cut 6 pieces of the length you need(don't know how long but you might consider buying 2 rolls instead of one by 25'). Twist 3 wires in one end and solder with silver lead-free solder(RadioShack one is OK). Secure wires onto necessary length with cable ties. You don't have to terminate the speaker ends rather than equivalently placing solder onto the bare wires.
Another words instead of taking factory terminated stuff you take parts and use them unterminated as a wire between speaker and amp.
It shouldn't take more than half hour to set this all up and the price will speak for itself.
The performance simply smokes M-series Monster speaker cables.

You could even schuffle with different single-wire factory terminated cables or mixing a single-wire with bi-wire for a "larger room of experiments" but it's truly pain to connect two or three spades onto one binding post(bananas cannot be connected a few onto one binding post).
I think it makes a sence to have a different gauge and grade for upper binding post.