You might find some useful info including goss on dealers here
http://www.d70users.com/index.php plus some pointers to the best recommended HK suppliers. I brought a LP classic mini trekker though the dude you linked with the slingshot LP bag , no hassles and I think about 30 bucks cheaper then in OZ .The mini trekker is very nice , comfortable to wear while hiking and plenty of room, in fact i was little surprised how big it is .