Try these; each has its own following.

http://www.musicworldonline.co.uk/bohm/sinfonia_emporio/default.html

http://www.allensmusiccentre.co.uk/lowrey2/liberty.html

http://www.roland.co.uk/products/productdetails.aspx?p=1199&c=79

http://wersi-shop.myshopify.com/collections/frontpage/products/louvre-gs1000-white

Or for more affordability

http://orladirect.co.uk/ringway-rs600/

http://wersi-shop.myshopify.com/collections/pegasus-wing-oas/products/sonic-organ

And for a genuine portable

http://www.roland.co.uk/products/productdetails.aspx?p=1140&c=79

Of course as you are from the US you could probably afford one of each without noticing any difference in your wallet size.

Enjoy

Bill