I was keeping the free Harbor freight coupons for the microfiber rags - I got so many of them, I use them and toss 'em!Acid free glue brushes! I really love being able to just throw them away once finished for whatever reason.
Next was a coupon for chip brushes - I especially like these for anchor seal for log ends, like the acid brushes - toss 'em when I am done and little guilt for the cost.