After hunting around a little more, I've found that Radioshack.com sells a 12 ft and 24 ft cables, 18 or 24 gauge, with an RCA connector on one end and either bare wire or spades on the other side. While the quality compared to the cables we typically discuss here is questionable, it fits the bill for my application. And the price is right - between $4.00 and $8.00 a run. If anyone knows of a better manufacturer, please do let me know. As soon as I get my 1070 back, I'll be buying these.

oh and I was mistaken on the wires/RCA plug association. The prong part of the RCA plug is for the 'negative' and the outer ring is for the 'positive.'