Today only, March 24th, you can use the coupon found here to snag 20% off your entire purchase at Michaels including sale items (note that exclusions do apply). Just go here to print the coupon or pull it up on your smartphone while shopping.
Also, note that you can print a coupon valid for 40% off any regularly-priced item (this coupon is valid March 25th-28th) and a coupon valid for 30% off your entire regular-priced purchase (valid March 29th-March 30th only).
Come back to let us know what you score! :)
(Thanks, Free Stuff Times!)