Happy Hollidays from Toronto!! I just ordered these: http://www.ebay.com/itm/4-New-CY-Ba...rig_cvip=true&rt=nc&_trksid=p2047675.l2557#sf from CY Badminton in Seattle. They are very tacky compared to most other brands that I have tried. Also, the foam ridge is quite prominent. You can see the depth in my picture, from left to right: CY, Gamma, Wilson, Head. The cost was $19 Cdn for 8 grips shipped. The Wilson Cushionaire might cost me $13 each. I have only started using them, so I won't comment on longevity. However, they do seem to be a little thinner compared to the name brands.
Update: Very Tacky!! Be careful if you have fragile hands as the new grip can make it raw. Best to use sparingly at first. Now, I am debating whether to redo the rest of my rackets.
I think they are deemed replacement, but outside of the ridge, they are fairly thin and can be used as over grips. I normally take the original grip off.