How much are slingshots worth?

I'm curious, how much are slingshots typically valued? Are there different factors that determine their worth, such as brand, material, or age? Are there any rare or collector's items within the world of slingshots that command a higher price? Additionally, are slingshots considered a viable investment, or are they more often viewed as a recreational tool? It would be great to gain a better understanding of the market for slingshots and their overall value.