I always wonder about those claiming to be stung, at least in the UK. Before you land anywhere surely you do a bit of homework and find the cost. If you then accept the cost and land there, you aren't being stung. Of course if the cost was in any way opaque simply refuse to pay more than a reasonable fee, provide your details and invite them to put their case in the county court where you can argue reasonable vs exorbitant charges. If they cannot justify their charges they wont win.