Coopers have there beer mugs reduced to $5 http://store.coopers.com.au/products/specials/double-insulated-stainless-steel-mug.
I got a couple for camping. I have a couple of those polycarconate ones but they don't stay very cool, have been looking for a good priced SS mug for a while. These ones are those double walled ones and are supposed to hold about 500ml. Freight to Qld was only $6 so for two they ended up costing $8 each