No idea if it will be honoured but a 6TB red is £200 here on its own...
Synology DS415+/24TB-RED (4 x 6 TB) 24 TB Network Attached Storage: Amazon.co.uk: Computers & Accessories
Synology DS415+/24TB-RED (4 x 6 TB) 24 TB Network Attached Storage: Amazon.co.uk: Computers & Accessories