I've purchased a few of them from REI Garage Sales with rips through the seat material. There a few brands/models I've found easier to sew/replace the fabric as the metal/plastic frames aren't needing anything.

So far my favorite is the Alps Mountaineering Camber chair. The fabric is held on by Phillips screws.

As to your specific predicament, it sounds like you aren't letting your stuff dry out and keeping it dry. Camping chairs last me a good five years and usually degrade from UV exposure. I've never had one rot from mold.

Buy from smaller, even local brands. Bigger companies will buy/be bought and be focused so much on profits that even the thing that made them famous will be costed out.

Buying small/local helps ensure that company will be around longer and continue to make good products.

Seiko SNK805/807/809.

I have the 807 (blue) and it's my go to watch when I might be worried about wearing my other vintage automatics. Bought it for $65 a few years back. You should be able to find them around $100 now. Choice of blue, black and tan.