Best prices will be from China based sellers, your best bet is to seek out a seller with good feedback and good prices on one of the China trade sites.
Advertising or naming selers in the open forum is against forum rules. Also be aware that people can reccomend sellers to you..but it doesnt mean that just becasue they had a good expereince, that you wont have any issues with the same seller.
There is always a risk/gamble you take with ordering from overseas suppliers. Having said that i've purchased from different China sellers lots of times over the years and never had any major issues. Your probably looking ant around £160 delivered for a V3 DUO Clone wth V3.2 firmware.. if it's a Ferarri clone.
Also be aware that although the newer V3 clones run the newer images, Ferarri Team are advising the security chip is too slow and may not stand up to futire anti clone measures there is also abug whereby if you record 2 programmes on different transponder and the recordings start at the same time one of them doesnt record...
Other issues include dodgy or underpowered PSU's which may have trouble moving motorised dishes..