I'm busy building a colony, but unfortunately it is a bit too small at the moment to start providing you with them. I'm hoping that by next winter (after the coming warmer spring/summer seasons) the colony will have grown enough for me to be able to start passing some off to other cham keepers in the area.
There is a guy named Steve who runs the Ga-Ga Grubs store. When I spoke to him at a show back in April, he said that he was hoping to have colonies of Dubias to sell by about this time. I don't have his contact details with me at the moment (if I find them at home, I'll pm you), but you will probably run into him at the upcoming reptile expo in Kyalami on 1/2 September.