Here are a couple Sekai's for sale
1. http://compare.ebay.com/like/110635909935?var=vipsrp&sort=BestMatch eBayitem 110635909935
2.<http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170591252308> eBay item number 170591252308
A freind had one. He crashed his mid level Sekai and under warranty he got either a series 4000 or 5000 frame. Very nice workmanship.
Thanks Charles Nighbor Architect Walnut Creek, CA USA