I got mine at Target as well. However, I've noticed they aren't consistently carried. I think I"ve also seen them at Meijer, and you might try WalMart, Costco, Sams, etc. Also, if you have a Dollar General near you, they might have the generic versions (courtesy of one of my clients!)
I just bought some today at my local grocery store.
In the past I've also used 2-1/2 gallon Hefty freezer bags (which, when packing, seemed to hold about the same amount as the 2-gallon Ziplocs) but haven't seen them recently. I liked them better because they had the little plastic zipper on them and were very sturdy, though the Ziplocs work fine too.
I fold my clothes, put them in the Ziplock/Hefty, squish the air out, and have nearly wrinkle-free clothes at my destination. They also makes it easy to repack if airport security goes through my bag and are great for bringing back dirty laundry.
(edited to correct Hefty size to 2-1/2 gallons, which I got at Target Greatland)
[This message has been edited by iff (edited 09-18-2003).]
I have never seen these in any stores in the LA metro area and I've looked (I haven't looked at Costco lately, however, because I've been stocking up on Kelloggs and there's no room left in the cart). However, I always find them in Texas when I visit my mother, so I always buy a few boxes.