I didn't notice they were having a sale last week, they have extended it though. Unfortunately it ends TONIGHT. (it says the sale is extended THROUGH Feb 1)
It's for a whopping 20% off merchandise. (not shipping or tax) But if you're not in their state, and are buying cases, that applies to your entire bill. DO NOT enter a coupon code, it will automatically enter the 20% code for you and any code you put in will remove it.
Just picked up two cases of M4 xplus's for under $100 shipped. That's a buck ten per, very hard to beat.
If you're one of those people that buys a lot infrequently when the price is low, this would be the time to do so. Sorry I didn't notice this sooner or I'd have given more notice.
-edit: Wednesday morning and it's still showing the coupon, so no idea when it will end.