Really, if the price of 2 beach chairs is not in your budget then you need to use beach towels or just stay home. Theft (and that is what this is) is not the way to do vacations.
Walmart cannot resell used chairs, even if they do take them back, and so that cost is passed on to all consumers. Somehow though I do not think you even care. There is frugal, there is cheap and then there is you.

Really, if this is not a joke I have no words.