It appears my last order with them was in late 2010, so definitely more than a year.

(Also, am glad I had a chance to go in and save a copy of my order history; I like to squirrel away things like that.)

They do seem to have my current address on file, but I have a pretty large backlog of things I haven't gotten around to ordering, so it would probably make sense to put in another order with them before the change, just to be safe.