One place to start is:
http://www.barryfarm.com/our_store.htm

Barry Farms though be careful - not everything is precooked (the beans).

For ready to go vegetables, cooked beans and TVP:
www.harmonyhousefoods.com

Also,
www.justtomatoes.com

And....go to Amazon! You can find many of these items from nearly every company up there.
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Freezer Bag Cooking, Trail Cooking, Recipes, Gear and Beyond:
www.trailcooking.com