sacattack.com also shows a count of how many of each item is left and also displays items you may have missed.
You can check the number manually as well. Just right click on the page and select 'View Page Source' then just Ctrl-F and type 'onhand' then scroll down and decipher the coding to find out how many are left and how many they had.
I'm a little addicted to SAC and used to do that all the time before sacattack or any other the other site became available.
Adam