1180
shopping rule theory
(media.kbin.run)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
You can 3D print a tool that lets you unlock the cart, then pull the tool back out, so you don't need to leave anything (coin or otherwise) in the cart to use it.
A good option if it's available to you, as long as it's tough enough, would suck if it broke up in there.