I hear that. I had problems getting my Audio Technica M3's. But they finally came in. Then the accessories took a while to come in but I had to start without the mounting plates and wait for those to come in too...
In my case, AT was causing the problems, not the distributors. New product, not expecting the high demand, so AT was unprepared.
I'd suggest you do the following:
Find a distributor who has what you want IN STOCK. As in, they have to convince you over the phone that they have it in their hands RIGHT NOW and it's ready to ship. Order it, cancel your other orders ASAP.
If it is ADJ who is causing the slowdowns, talk to pre-sales. Nice folks, they'll help you out.
As someone who works in the entertainment business, I often get the situation where I get the job last minute and then have to get something else last minute and sometimes I am playing the "hurry up and get here" game ordering thigns. Fortunately, I don't really run into that any more.
You're being pro-active. That's good.