I was at a nursery this morning and they had this very healthy specimen (actually 2 "Atropurpureum") looking for a nice home. It was easily 8 feet across and very nicely contained a wood box.
Presumably 'Dissectum Atropurpureum' as in 'Beni shidare' or 'Ornatum' and taking some time to produce - hence the price, which might be pretty good, actually.