I can never find that 2 lb SOS at the Walmarts around me. Academy down the road doesn't stock it. Going to run errands, so will check another Wm opened recently. I wish Mr Crappie had a 2 lb test.
Try Stren Crappie Mono (not regular Stren.) The 2# diameter is .15mm, so it's probably closer to 3# line. It's good stuff. My local Walmart carries it.
Trilene XL also comes in 2#. I use it a lot. Diameter is .13mm.