If you're willing to risk having someone take you up on it, price your dishclosth at $35, tell them for the time it takes that's a steal. Put the price with the picture. I don't think you'd get many takers.
Maybe explain to your mom that she merits special favors, you give her handmade items because you love her.
I've seen hand knitted things for sale that were simply beyond my price range but figured whoever got the price was selling their time way too cheaply.
Happiness is catching that dropped stitch while it's still fixable..