Barry go to the Battery Wholesalers at 8-10 Falcon road. PH 90663036. Off boucher road near the enterance to the guiness depot. They should have what you want for less than half that!!
Had a hawk battery on my old GS, and never had a problem with it. It came with the bike so not sure where you would find one, but I bet someone in the forum would.
Hawker Odyssey got mine from MotoWorks but lots of places sell them.
Really good battery, no maintenance, higher cranking amps. It stops the 'clock resetting' problem and ABS issues sometimes found with the original battery.