I would say $280 at most, it really depends where you live but I myself couldnt sleep at night if I had to pay more than a dollar per tenth of a gram. Not braggin but in my area $180 is standard for an O of pretty good stuff. Ive heard talk of people getting them for $130-$140. The ratios go like so

1g -$10
3.5g-$25-30
7g- $50
14g-$90
28g-$140-$180