I still find that the Netherlands/Sweden is a great place for finding NOS stuff listed on-line/e-bay...95% of the hard to find items and discontinued parts I get, are outa the Netherlands and Sweden.
I will say, it took/takes a great deal of patience, waiting for something to pop up, checking e-bay relentlessly day after day....meaning several months sometimes...but well worth the wait when something does pop up, providing it's not something you need "yesterday".