This can be welded or brazed fairly easily by a skilled pro. Either way, the key is properly preparing the break according to the method chosen.

If your local bike shop has someone versed in frame repair go there. Otherwise, I've found that the best place to find someone with the right skills is at a motorcycle shop.

BTW, if you know a skilled welder, not expert with bikes, make sure he knows that the dropout is either brazed or silver-soldered into a thin wall tube.