Laser Accessories - Diffraction Gratings (Where to buy them nowadays?)

Hey guys, I've been on the lookout for some good laser accessories like the dot matrix diffraction grating from dragonlasers. I contacted support for dragonlasers and asked them about the dot matrix diffraction gratings but he told me they will not be restocking them anytime soon? Do you guys know of any other place that sells a good diffraction grating dot matrix and other accessories? It seems like optotronics has a set of laser acessories for pretty cheap, but their diffraction gratings seems to be a film like most of the stuff on ebay.