I have 50+ types of sweet potatoes: many heirlooms, all different colors including some ornamental types. Well stocked with Japanese purple skin white flesh (Murasaki), Korean Purple skin/flesh, Caribbean purple skin white flesh. Also have many other fancy/tropical rootcrop plant types, some fruit stuff and more if thats what it takes.
Korean Purple:

I can match tubers for tubers, but they must be from your garden not from the store (not Okinawan). I'll also match tubers for your strips of vines, or whatever. If sending vines its best they're packed in moistened cocopeat, or first soaked for a couple days in water (leaves sticking out) in a simple bucket or whatever. If you're interested in swapping per volume (say matching sized Priority Mail boxes) I'd be willing to put more than one type of thing in the space.
Motivated & flexible. Also interested in making my list longer of course

My other trade threads:
http://tropicalfruitforum.com/index.php?topic=10816.0http://tropicalfruitforum.com/index.php?topic=11157.0Some other SP types I've gotten in this year:
All Purple/Purple Delight
Allgold
Amish Bush Porto Rico
Barberman
Beauregard
Becca's Purple
Boniato
Bugtussle
Bunch Porto Rico
Carolina Nugget
Carolina Ruby
Cook's Family Heirloom
Dingess White with Pink Eye
Envy
Ginseng Orange
Georgia Jet
Georgia Red
Hatki
Hernandez
Ivis White Cream
Jersey White
Korean Purple
Mahan/Bradshaw
Marguerite / Margarita (Ornamental)
Memphis Pride
Midnight Lace (Ornamental)
Mirasaki
Oklahoma Nugget
Porto Rico
Razorback
Red Wine Velvet
Ringley's Porto Rico
Satsuma-imo
Travis
Wakenda
White Triumph
and a few yet ID'ed types + some other new stuff mostly ornamental