Prescription Polarized sunglass lenses - have I been ripped off?

I recently purchased a set of Oakley wire frame sunglasses (the
thickness of the frame for the sunglasses is identical to the frame
thickness of my glasses) and had a local optician provide me with
Polarized lenses to go into the Oakley frame. I had expressed
significant concern about the thickness to which I was told that he
had a lense/technique combination that would provide the thinnest
possible lense for my prescription. Now I have received the new
lenses and they are more than twice as thick as my current lenses in
my regular glasses and they look like giant coke bottles. I brought
this up and was told they couldn't be any thinner since it was really
two lenses sandwhiched together. However, I am completely
dissatisfied as this is exactly what I told him I wanted to avoid.
The polarized lenses at the point nearest the nose are not thick at
all and similar to my glasses, however the polarized lense at point
nearest the earpiece are over 7mm thick where my regular glasses are
less than 3 mm thick. The wire frames for both my Oakley sunglasses
and my glasses are 2mm in thickness.

Have I just been ripped off so this guy could sell me a very high
priced ($325) pair of lenses.

My prescription is:
-2.75 - 0.75 x 110
-3.00 - 0.75 x 55

I appreciate any help you can provide. Thanks for your time.