Most probably, Prime is bundling HDDs with the NAS. Contact Apical directly. I know for sure the price as I was about to buy it but got the N2100 as I need faster transfer speeds.
The Vantec does not have any media servers. The N299 has bays for 2 drives, RAID, Media server, BT support etc. You can very well use it as a download rig in addition to just using it as a file server/ media server. It's a little slow so even though it's got 10/100/1000 ethernet ports, it crawls to 10/100 speeds. Other than that, it's a steal for the price.
Edit: I got
this for 17k approx from Apex Enterprises. I'm PMming u their contact details in case u need to contact them.