This is very, very sound advice. The other is to monitor estate sales in your area, for the reasons others have mentioned.
One time in London just a few years back, I started up a photography class at the school I was teaching science. I e-mailed staff asking if they had any cameras they'd like to get rid of, and requested they drop them off in a box I put in the staff room. I got quite a few cameras donated--including a couple of gems. One was a Yashica T4 in mint condition (errrr, I "loaned" that one to myself, and replaced it with a decent SLR from a thrift store that I went out and bought for that purpose; wasn't a good teaching camera you know, with no manual controls and all...), and the other was an Olympus OM-1n with the particularly nice mid-range zoom, also mint. That one, I knew who had donated it--I took it back to him, and explained to him it was a pretty desirable camera & lens, and that he might want to look at selling it. He said he really had no use for it, and was happy to give it to us.
I've recently moved to Vicksburg, Mississippi, and even here, which is not the most densely populated or cosmopolitan region of the country, I've scored some nice deals at estate sales the last few months. They've been a bit thin lately--seems like not many people popped their clogs around the holidays, excuse my making light of others' misfortune--but I've found some quality old (and some more modern) stuff that I can put to good use back in October and November. I try to get there at the opening of the sale if they have some interesting stuff advertised, but I've found that in my area, the people who generally go to those things apparently aren't so keen on camera gear, so I've managed to snag some fun things for reduced prices on the final day of sales, too.
As you probably don't have so many relatives dying frequently, see if you can find others' relatives who have passed on with lots of camera gear stashed away.