I have a piece of galvanised metal sheet, I bought a sheet and had it cut in half and used one half for my bike bench and had the other piece sitting around and I'm never going to use it.
Size: 2.4M long x 61cm (2 ft) wide x 3mm thick and it weighs a ton
$80 and I can deliver to the nats on Saturday if someone buys my bike and I'm deliver it there
I don't have a picture of the sheet, but its the same as the one on my bench in the picture below: