Synology DX517 5-Bay NAS Expansion Unit - for select Synology NAS (DX517) - supports DS1821+, DS1621xs+, DS1621+, DS1520+, DS920+, DS720+, DS1819+, DS1019+, DS1819+, DS1019+, DS218+

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Historical lowest prices

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Currently available from the following stores

Store	Highest	Lowest	Current Price
	$940.58	$601.99	out of stock
	$739.20	$719.99	$719.99
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(NAS)