Simply Games are one of the reasons behind this. Simply Games were selling the R4 along with others then they made a press release After consultation with Nintendo we have decided to no longer sell the R4 due to piracy blah blah. Which roughly translated meant that Nintendo were going to pull the plug on them. So Simply Games are now leading the fight to stop the sale of the R4 and similar (wonder how much they made though?) and Amazon was going to be contacted as they were one of the biggest market places for them.
Nintendo have not really complained too much about these in the past as there is no denying that they have helped hardware sales but now they are clamping down. There is now a call with Indies in the UK for all sales to be stopped.
If Amazon do pull them all then it could mean a price increase especially if sites in the UK are also stopping them.....but doubt all will
