I need eight of them to build a giant scale, even used would do (In Good condition though). 15-18 kg torque preferably

What are you up too??

for
http://phoenixmodel.com.vn/product/detail/96-ph057-cap-232

with MT 45 gas

I would recommend you to buy new servos.

your advice taken, buying new ones. 

Why would you need 8 of the Hi torque servos for a 45 CC plane ?
Shouldnt 5 high torque and 1 standard ( for throttle ) be enough ?

i need ten, building this one too, http://www.egaircraft.com/products.php?sort=14&id=26

in a hurry, want it to stabilize before the meet, otherwise will have to make do with Katana and Yak 55 with asp 120 4s , of late it is tending to cut in hover can't figure out why  

Got the standard Servos 3003 from sunil, couple of days back

Lovely plane that is. ( EG Extra )