For the next few weeks, every paid Somerville library is on sale. The discounts vary by library, up to 30% off. A few of them:
Mallet Drums — $79 → $55 (the deepest cut)
Elskavon Toolkit — $59 → $45
Soft Drums — $79 → $65
Woven Violin — $99 → $79
No code needed. The sale prices are already live on the site, so what you see is what you pay.
If one of these has been sitting in a cart for a while, this is a good moment. I don't run sales often, and these prices go back up when summer winds down.