That's what I did. Fastenal has washers with a 2" inner diameter opening, which makes them a little loose on the bar at my gym, but not disturbingly so. On my kitchen scale they weigh out at 8oz +/- around a half ounce, so a pair weighs roughly a pound. The wife got me 8 washers, or a spread of 4lbs in 1lb increments for about $25 for Valentine's.