Sealed is the sticking point obviously as unsealed can be found rather easily
I remember a complete set of sealed selling for around 200 - 250 USD on ebay maybe 3 or 4 months back
Took a long while to with a bunch of relistings
I'm sure you can get sealed copies but you'll always have to keep an eye out and it will take a LONG time
Also check Amazon
http://www.amazon.com/gp/offer-listi...&condition=new
http://www.amazon.com/gp/offer-listi...&condition=new
I'd contact the sellers about the condition though as Sealed doesn't always mean mint