Ebay is hit or miss...mostly miss for an item like this. There are too many buyers like yourslef looking at those types of items...Look at the number of hits on some of those pages!
I would suggest you check out on online dealer with a respectable rep. I have used several, got great prices on new gear. Here are a few I have used for various items...
good luck
http://www.bethel-marine.com/
http://www.brokenlegdave.com/index.html
http://www.thegpsstore.com/cgi-bin/S...474+1050378000
http://www.vitmarine.com/