GBU664**S GBU664**S (GBU664--S) Base Rack for S2E, 3 I/O Slots/ Expansion Rack for S2T/S2, $300.00 | GUN612**S GUN612**S (GUN612--S) TOSLINE-F10, Single bus, twisted paired-cable, Slave stati $1,168.00 | MDR-100-24 MDR-40-24 - 24 Vdc 3.33A Din Rail Power supply $89.95 |