Pretty much what Gene says...
I buy a bunch there I'm about to order a set of shocks for my truck in a few minutes from there...
About the only difference from what Gene says is that alot of the closeouts aren't stuff they won't be carrying anymore, but rather the same exact part, same brand that was sold as a private label thru a particular parts chain. Luke car quest... They got bought out by advance auto, and you might get (example) a set of Gabriel shocks that are in a car quest box. Exactly the same part as in a "Gabriel" labelled box which they will still have. Alot of times they have the "closeout" and the same part, same brand at "regular" price, and if you click on the "closeout" box you'll see a drop down that shows the "regularly packaged" version for more money