Hi,
MSY is a computer chain and they have a shop in Brisbane. I dont think the speed really matters as you are only talking about a few seconds difference.
Anyway
Generic CF cards,
1G / 2G / 4G / 8G (CF) - $21 / $33 / $56 / $105
8 gig for 105 bucks is pretty cheap
SANDISK
“Genuine” Sandisk CF 1G / 2G / 4G - $28 / $36 / $69
Here is a link to the price list
http://www.msy.com.au/Parts/PARTS.pdf
Paul