MV used to have a discount code (5%, I think) but did away with it in favor of the reward point system. I only used the discount code once (twice at the most) then forgot about it because his prices are so low.
However, along with the reward points he will also throw in a free sample every once in a while.
Also, don't forget about the free flashlight (I think he still offers it at checkout). I got one with my last order.
As for the reward points, I have over 200 so far but haven't used any of them, again, because his prices are already so low.