Pool lets you search about a week ahead.
Snapnames lets you place an order. No bid, unlike Pool. First come only served at Snap.
DomainCatcher appears to be an up and coming star in grabbing drops.
NameWinner sometimes wins.
SnapCheck will give you an idea of what's dropping in different categories.
There are several drop list sellers. Never used one.
Do your homework. If you have a fixed target that's not in use pick up the phone and call. These things sometimes work out in very satisfying ways.
Chances of you winning a prime domain are slim to non-existant. At Pool you will be outbid. Decent domains are bid up above $10,000 at Pool.
BuyDomains does a pretty good job of beating out the competition but I think they're about to start withering from bloat - 300,000 domains and they're picking up some junk lately.
There's some decent domain forums, places where resellers congregate and where the aftermarket prices aren't too nuts. DomainState is the only one I post to. Many forums are filled with juvenile nonsense. DS isn't half bad - they just don't follow my advice about raising the reputation of resellers by banning gross cases of cybersquatting.
Sedo is a place to buy in the aftermarket. Too many looney prices. Afternic - ditto.
URLCollection has a nice collection and their pricing is reasonable. There's a few other big aftermarket sellers. Also, when you see domains tied to search pages it doesn't hurt to ask. If your timing is right - read, the owner's mortgage is overdue - you can work out some decent deals.
Namewinner has the auction before they actually gain control of the domain. So, you can spend time winning an auction and then never win the domain.
Here are just a few sales that have happened or are currently going on in the expired domain Auctions. The domains are already secured - so these sales *will* happen.
wwu.com -- $10,050
ogv.com -- $5,067
babiesname.com -- $3,100
ahole.com -- $1,050
financialsupport.com -- $560
This is a very small sample, but you should get the idea