Discount when customers buy 2.

This is for my own handmade item FBM.

What is the best way to offer discounts when a customer purchases 2 of an item? I would like the savings to be seen on the listing. I was thinking of using variations. One variation is a single with a price of say $15. Another variation is a 2 pack with a regular price of $30 and a sale price of $25. This would show the discount, but I don’t think perpetual sales are allowed?

Any thoughts?