There is a Pono for sale on FMM for $300 and includes a hard case. It can be found here:
https://www.fleamarketmusic.com/marketplace/default.asp
Scroll down towards the bottom of the page. I don't know the seller or anything about him, just letting you know about a good deal.
If you want something cheaper, I'll sell you my Koloa KU650 for $175 shipped. Let me know if you are interested.