I've bought WD Treasures (factory sealed, in tins) from Ebay before and had no problems so long as the seller had at least 97% rating from at least 25 buyers, and was in the US...
I NEVER would buy from anyone in Asia, and I'd only buy if it's factory sealed, in the tin - that virtually guarantees that it's not a fake or copy!
and many of them have a Buy It Now option...which means you can pay the sellers minmum (say $30) and have it it's way in a day or two...
It all depends on if you can (or want to for that matter) pay between $20 - $35 for each one... and of course you need a credit/debit card that you can use with PayPal, or Western Union Auction Payments.
My main problem of course is that I live outside the US, so cannot buy from some sellers...but also I cannot send Money Orders and so on, which complicates things!
Good luck completing your collection...
Can't wait for my Wave 3 Amazon orders ....
great review of On the Front Lines btw Luke
Philip