If you use a beach chair often around here, expect to purchase a new one every year. If you are lucky, maybe you will get two seasons out of it. The best chair would be the plastic Adirondacks, available at Home Depot / Lowes during the Spring, but they are bulky and do not fold. They are only $10 ea. The folding beach chairs, to which you refer, are sometimes found at Target, but the good ones are pricey. Wal-llly World has a big variety, but they too are pricey, and most are cheap-o quality. The need for yearly replacement comes from following reasons. The stronger metal frames, which are heavy, will hold you up for a while. However, when that rust weakens the chair, and it will, the chair will fold up on you. The lighter weight aluminum chair won't rust, but it weakens after continued use, and it too, will colapse on you.
When this happens to you, please don't pile it up at the Beach trash cans. People sometimes leave their collapsed Beach tents and chairs piled up around the trash receptilcles, and it looks like crap. Get it out of there.