My brother is removing two tattoos, one on his back which is only black, probably around 5-6 sq inches, and the lower half of a 3/4 sleeve, which has all kinds of different colours.
He's paying £130-140 for both I think.
I went to the same place, I'm getting a black and grey backpiece removed which takes up almost half my back and he's charging me £110 a session and treats the whole piece in one sitting.
I guess his prices vary mostly based on the colours used rather than the size of the tattoo because mine is bigger but I'm paying less.
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You can see my tattoo before and after the first session in this thread - http://www.lastsparrowtattoo.com/forum/tattoo-removal-coverup/3573-any-good-laser-places-around-long-island-nyc.html#post60140