My mom collects (or used to) dolls, Planters Peanut jars, clocks and Redwing pottery.

My Dad collects FISH (decoys, lures, reels - anything fishing related)
Let's see what Dad is buying on Ebay
Here's the link to what Dad is bidding on:

http://cgi3.ebay.com/aw-cgi/eBayISAPI.dll?MfcISAPICommand=ViewBidItems&userid=barnwoodbob&completed=1&sort=3&all=1&rows=25

Check his feedback... "fish-stuff"