PM stage 3, they came generally give 5% off. Directly through UPR has 10% off coupon codes if you google coupon codes but they charge approx $15 in shipping which nets out to about the same as stage 3. I haven't found any coupon codes through MAK. With the codes you can get the regular dual valve around $330 and the mega for $370ish. Would love to see a $349 shipped deal again on the Mega can like they did during the holidays. I'm giving it more time to see if any deals come along.