Glenn; ok, I might ask you again come next June; by then I should have had a harvest as well and will be able to better decide if I want more trees. I'm also growing not just ground cherries, but morelle de balbis and pepino.
John, Baker Creek sells the standard variety:
http://rareseeds.com/cart/products/T...to-757-76.html
Trade Winds also has an unnamed yellow, but I've never ordered from them:
http://www.tradewindsfruitstore.com/...-Yellow/Detail
Unfortunately, I have no idea where to find the other cymph. species.