I recently ordered 50 2" net pots from jim's orchid supplies out of florida, as well as two large planks of treefern (I'll cut it into pieces as I need mounts). He also sells 3" and 4", I think. I really like net pots, if I'm going to be growing a pleuro in a pot, for just that reason. With the open structure of the pot, the moss can dry from all around and doesn't get soppy or compacted in the pot. Also, you might look into shredded treefern as a potting medium, as it is more open, dries more evenly, and doesn't rot like Sphag. Inorganic/inert media are also great for pleuros in pots. I used to make a mix of fine treefern, charcoal, and perlite for the bigger pleuros that would be a pain to mount. I imagine I'll be making the same mix, once it becomes necessary, this time around.
Here's a link to Jim's Orchid Supplies
http://www.jimssupplies.com/
-CJ