Australian Direct - Just in case you don't know of this company who sell a range of deep cycle AGM batteries, including the thumper units (scroll down left column) at competitive prices, 24hr service, free delivery, with 100% customer feedback. I have no affiliation wit this crowd, I've just bought a few items from them in the past - including a 30Amp/hr thumper - good service and fast delivery.
http://stores.shop.ebay.com.au/Austr...ct-4wd-Outdoor
Cheers, nix