Apparently the answer is found on this very site:
'However, the US Sega Master System version of Sonic the Hedgehog was a very low quantity late-release, and today commands the highest price of any game on the system. Think paying $200 for an 8-bit downgrade is steep? Consider that the only difference between this version and the common, $2 PAL version, is a UPC sticker pasted on the packaging! Since the Master System was region-free, Sega simply shipped the PAL extras to the US. It even has the multi-language manual!'
Sorry for wasting everyone's time, move along nothing to see here...
