Obviously not sure in USA but in ; North East England they are as follows -

0.75g = £5
1.5g = £10
3.0g = £20
1/4oz = £35
1/2oz = £65
1 oz = £125

We have some idiots over here who try and charge you £150 for an OZ , but only £65 for a half OZ , yes i think they are retarded !!