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I was browsing about eBay and this came up:
New Lowepro SlingShot 200 AW Digital SLR Camera Sling Shoulder Bag Backpack | eBay
The price is better than I've seen anywhere else, although this has been replaced by the 202 model which has the means to attach a small tripod to the bag.
The pros and cons of this sling bag has been debated here in the forum ad nauseum, but you can pack a fair amount of gear in this! The depth of this bag is deep enough to carry any Pentax DSLR with the battery grip attached and still be able to get at the camera without taking the bag off the shoulder (a bit harder to put it back in though). I have one but it is impractical for any lengthy hike in the woods with lots of gear.