Yates in New Zealand sells "Winter Triumph" iceberg lettuce:
http://www.yates.co.nz/product...
So do these guys, but "for delivery in New Zealand only":
http://www.oderings.co.nz/Shop...
Awapuni just calls it "Triumph" lettuce, but they mention "winter". (Were these the guys that sell lettuce PLANTS online?)
http://www.awapuni.co.nz/produ...
Van Loon in Oz sells Yate's seeds:
http://www.vanloonsnursery.com...
I didn't find any reference to a
summer Triumph lettuce. Well, unless you say that New Zealand's winter is the Northern Hemisphere's SUMMER ... so it really IS a summer lettuce ...