If anyone else is looking - eBay isnt' a bad road to go.
I often list new special priced 15 and 21 chord Oscar Schmidt Autoharps on ebay. If you're interested check out listings under jafmusic_99. With a full selection at a nice discount at jafguitar.com
It's always nice to have the full Manufacturer's Warranty.

Shipping is the flat UPS rate.

Sorry, I can't help you out with the strings though.