Jokes for Sale?

Today at Target:

Lily (6): Mom, will you please buy me something from the dollar section?
Me: Are you going to give me a dollar when we get home?
Lily: No
Me: Well then no - you have to pay me back if you want something
Lily: Well how about I pay with you a joke?

Ten minutes later at the Dr. Office:
Lily: Mom will you text Auntie and see if she'll buy me the Toy Story and Princess silly bands? Tell her I'll pay her with a joke.

Apparently Lily has jokes for sale - all it will cost you is something from the dollar spot at Target or some silly bands.