The one's from the Dollar Store are definitely cheaper. But they also did not work for us. After about 3 minutes, all of them popped off the shower wall. I wound up throwing them out. And no, I didn't hang too much. One popped off with just DD6 bathing suit top on it.
The clothesline in the shower works just fine for drying things.
If you really want to use the suction cups, be sure to try them out at home first to make sure they hold what you want them to hold.