I'm not sure where your looking but I just looked again and they have 18 different sizes and styles in stock and only one says low stock.
When will you be at the track again?
I've been runing the ten spoke 18/20's for a month or two now on our htu 3p track. Thay can be bent but have come right back with a couple of taps on a solid surface. I also have a set of wheels from Aluma-Tech which are much hardier but the realtracks site shows these to be out of stock now.
I am looking to get some rims and aluminum hubs for a Murcielago not sure which size to get. May be one of you knows? Thanks for your response.