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Fishmore,

You and I can no longer buy the older technology motors here in California...
It is against California law to sell them new here.
Even the Yamaha website no longer lists them so they no longer make them in the USA anyway. Not sure about other countries.

No matter what, if I were to buy a new engine, I wouldn't even consider older technology even if it were available in California which it isn't.

Mercury 2 stroke oil is the same... Where do you buy your oil?
Just about every place carries 2 stroke oil and I live in the boonies.
I buy it buy the gallon or 2 1/2 gallon jugs..

EDIT:
I see you said about the XD-100
Not everyone uses the XD-100. Maybe that is why it is harder to get at this time in your area.
It would be good to know who uses the XD-100 in there new E-Tecs....