Ontario can have good deletes too, but they seem to be scooped up pretty quickly. Commerce just opened last year, so they don't get quite as many deletes as the other two, but you can still find a good delete on occasion. If you think you're going to be buying a lot of stuff, keep in mind that Ontario and Commerce are in LA County, so the tax rate will be higher.
A lot of this depends on lucky timing, but I suggest that if you are looking for a particular bag, call the outlet and give them the style #. If they have it they can hold it for you for 2 days. This is also hit or miss, as some SA's either don't know what's in stock or are too lazy to go look.
30/30/10 refers to the crazy discount strategy
Coach has been offering recently on deletes. (They may tell you that it applies to the MFF bags too, but since they never sold those purses at the original price marked, I don't count those.) Thirty % off the original price, then another 30%, then another 10% on top of that. The first 30% has been pretty standard lately, then the 2nd 30% they offer is supposedly an extra discount and the 10% an even additional freebie. Keep in mind, however, that they used to offer a standard 40 or even 50% off, and then the additional 30% off automatically at the register. But Coach has been trying out different pricing strategies this past year, and I think I read the other day that some outlets were no longer giving the additional 30%. The pricing has even been inconsistent from outlet to outlet, with some giving a base 30% off, while others give 50% off.
Hope this helps some and hope you and your friends find some great deals!