clean chaeto

I have extra chaeto that I am currently keeping in my 10 gal tank. I'm selling it for $10 for baseball size. Pickup in Bethesda MD.

I am in the process of setting up a sump refugium for my 40 gallon tank. But I am having a hard time finding chaeto. BRS is sold out. Algae Barn is sold out. Just about every place that I have seen highly recommended is sold out. So if I find someone selling chaeto that hasn't already come...