I recently found that on zcube.cn they are selling the dayan wheel of wisdom for 59 dollars without shipping, applying shipping and the code zcube (20% off), paying with euros € it is 40 euros ( 50 dollars) but paying with dollars is 55 dollars don't know why-- but the interesting part: buying 6, using the code and shipping its 167 € (208,75 dollars) being each at 28 euros or 34 dollars.
if one person from europe buys 6 or more, and then he ships it to other people it could cost about 40 dollars each. what do yo think??
the same for any other puzzle