That's how I got. I pet store employee thought it would be great to get. They didn't realize what 1/2 sling meant. I don't think hapalopus sp. Columbia small generally go for 15$. Could be a large though.
@Matttoadman Mine was about 1/2 inch and was 30$, and it was a large. And small are generally more expensive than large I think, so I think you got a great deal!
And this species is one of the best too, they grow very fast and are great eaters