Do they make garter snake traps?

[Stefan-A]

because they are easier than corn snakes from what I have read.

As a Finnish person might express it, starting with garters and graduating to corns, is like climbing a tree arse first. Corn snakes are the simplest, most basic snake a person could possibly start with, regarding everything from the setup, to the diet, to handling and the amount of literature available. One thing is damn sure, if you can take care of a garter, you can take care of a corn snake.

There's simply more things to possibly screw up with garters and natricines in general, than there are with corn snakes.