For Performers Forever In Need Of Sheet Music

Hi. 

I've come across a deal like this: coupon for a 15% discount on any sheet music at MusicaNeo

All you need to do is enter the code SAVEME15 at the checkout.

Honestly, I have never used coupons before (to my shame) and I'm wondering if there are a lot of musicians who do it regularly? Taking into account that performers always need the sheets, is it a good way to save some pennies?