Okay, so it's not technically a holiday here in the Great White North (we did that last weekend), but it is a holiday weekend in the US, and there are great book deals to be found all over the place!
Torquere Books is offering 15% off all purchases from now through Monday, May 28 at Midnight (EST). Just put 'memday2012' in the coupon code box when you check out to get the discount.
JMS Books (and Queerteen Press) are offering 30% off the regular price of all their e-books through Monday, May 28. No codes or coupons required . . . just pop over and start shopping!