Well, I saw they had the ProLine sponges online in stock, but they didn't actually have them when I arrived to pickup my order. I had to buy the Armaly brand again, which seem fine, but are a little bit thicker/heavier than the ProLine ones.
Maybe next time I will order a whole bunch online and have them shipped. But that seems kinda silly. I go through these like crazy, though, since I throw them away after each use.