Valid on first purchase only. You can use it on just about any purchase, but there are exclusions I would guess for example gift cards. Valid 4/3/14–4/13/14. Maximum discount $200.
I used my 10% with a $700 Honda HRX217 self propelled walk behind mower. Then I got a free year of warranty extension from Honda (making it 6 years total) just for registering the mower with Honda (third offer down).
The Honda One Year Extended Warranty Offer is good on all Honda HRR, HRX, and HRS residential mowers, purchased March 1st through May 31st 2014. must register within 30 days of purchase.
I also tried a Harbor Freight 20% off coupon, but no surprise, that was quickly shot down.