Dan's Small Parts in Montana is a reliable on line vendor.  Many over on 
the QRP reflectors have used him for component purchases. 
I would not go for large quantities for bargain prices from unknown 
auction site sources.
The electronics trade press has had a lot in it about recent large scale 
counterfiting of all kinds of parts, especially marking smaller die 
transistors than the original part, with logos of manufacturers who have 
not made that part in years, and the parts fail soon after installation 
due to current and heat issues.  Particular targets have included any 
part no. that has been around for years, such as the 1N4007, which might 
be considered a "standard", and widely used still.  Some of the legit 
distributors have been stung by these parts with counterfit markings.
-Stuart
K5KVH
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