There isn’t much fine print, but as best I can tell, this is a straight $10 off coupon – no minimum order. Which should definitely make for some savings!
For example, their birkonim and siddurim start from $9.95 – or, you know, free after your coupon!
Shipping is $7 for the first book and $1 for each additional book.
(*Geek alert* Koren is my all time favorite Hebrew font.)