As with all clearance your store and selection may vary on Halloween Costume Clearance at Walgreens. Make sure to use the $5 off coupon from their weekly ad.
These are some that I saw at 22nd and Harrison in Tucson.
The $5 coupon may need to be manually taken off and make sure your clearance price is entered correctly.
Some with coupon would be as low as 19c!!
Let me know if you find any :)