Reddit mentions of (10) 2" USS Flat Washers - Zinc Plated - 4-1/2" OD

That's why I love 5/3/1! My OHP progress definitely isn't linear and I get stuck at/go up and down around the same 1+ for forever, but it's so satisfying to finally break through.

Have you considered bringing your own fractional weights or some washers and making your OHP programming calculations round to the nearest lb/half lb/whatever? I have washers because they used to be wayyyy cheaper than the fractional weights. TBH I'm too lazy to carry them to the gym, but when I was using them they were pretty helpful in working up my OHP in smaller increments.