I too would like to be able to buy spare trays. It would be nice if they also included a set of 3.5" drive screws.
DS1511+, DSM3.1-1594, 3GB DRAM (Kingston 2GB), 2x WD1003FBYX, 1TB, 512byte/sector, RE4 enterprise drives, single RAID 1 Vol.
Java 6/24, Syn. asst. 3.1. Static IP, Gigabit Ethernet, wired CAT5e, all on same LAN segment & switch.
Win XP SP3 or SP2. Laptop & desktops, Android phone.