now a reliable supplyer for second hand machines in portugal is overpriced as fu.... like an s17 pro cost 3000 euros wili in china cost 700 USD
Um, welcome to the world of economics? Resellers have to pay for the miner + import taxes/VAT, shipping, etc. + make some money otherwise what's the point? Since you don't live in China that's just how the world works.
The logic is indeed correct, but making a 2300$ profit on a $700 investment is unreal, not with the given market condition.
OP, you need to make up your mind on what gears do you actually want, that is the first step, the rest is easy, the Chinese resller i deal with provides DDP shipping which takes care of all custom and stuff, if they happen to have the gear you want at the price you like I will connect you both to deal directly.