Prices for NSW, Australia (well, my neck of the woods
). all in grams unless otherwise stated
.6 - .8 - $10 ("tenner")
1.2 - 1.4 - $20 ("Foil")
3.4 - 3.6 - $50
Quarter ounce - $80-$100 (Quart)
half ounce - $150-$180
Ounce - $240-$320 (oz)
Differences in weight/price depend on... well, just about every factor. Quality, quantity (bushfires play havoc with getting bud around I hear), dealer, time of year, time of day etc etc :P.