Right now, I would say that the primary problem is ASCA being swamped with messages and orders for the Xmas rush.
Then there's the supplier who may well be out of a lot of things.
And then, it all depends on exactly what you order. If a slide was in limited production to start with, you are competing against everyone in the world who wants one.
With what just happened in Asia (the quake that destroyed internet cable lines), responses may be even longer to come by. If your part is manufactured in Taiwan, it compounds the delays.
And finally, when the stuff arrives at the Border, it faces the backlog of things coming in AND the whim of CBSA.
Murphy's Law in action.