I have a brand new NE-774V that I was originally going to use to connect my amps to my RF HU, I've decided to go the aftermarket HU route instead. It's still in the original box, with instructions, and includes a CD on how to eliminate alternator noise.
This is probably the best LOC on the market and sales for $34.95 new not including shipping. I'll let it go for $25 with shipping included.
More info:
http://www.autosound2000.com/adaptor_products.htm
I'll take PayPal payment.