In December, there'll be a soft, cuddly Portal turret available to buy. Those who like their Portal companions a little squarer (but just as cuddly), you get yours a month earlier.
In November, NECA will release its first piece of official Valve merchandise, in the form of a plush Companion Cube. No word on price yet, but it'll be 6″x 6″ (x 6″!). And soft.
And, for series purists, probably quite flammable, too.