I’ve only ever seen them offer a $10 off anything online coupon if you signed up for their mailing list. I had to setup 3 separate accounts to get individual coupons and purchased all 3 piece of my Monsterbox gear with them
I think that’s the best deal you’ll see unless you’re Military, they offer a % off discount a few times a year which would probably be best…I have no idea if there are exclusions for that though…
The box does add some weight to the back of the ATV, but you can’t beat the storage and especially the side mount attachments for the Rodbox & 5 gallon bucket holder (what I use them for)