These are apparently searchable, and can even be bought normally on the Auction Houses. The exception is that dropped 2.0 Legendaries are BOA, so despite the ability to buy them, you won't be able to send them to your stash, while the seller still gets to keep the gold. Crafted Legendaries can be bought and sold normally though as they are not considered BOA.
EDIT: No longer relevant with hotfix.
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