How much does sskai sword worth

How much does Exalted Aegis worth if I want to buy?

It costs as much as the amulet of mists which is around 15k. (assuming you mean the green exalted)
Your thread title is for sskai's sword, that one is 5k~.

You can check canthan greenie prices from here (last pages have the current info):
http://www.guildwarsguru.com/forum/s....php?t=3036210

some ppl sell exalted aegis for more than 15k up to 30k but its worth 15-20k