Where can I get good dark brown contact lenses?

I have blue eyes but I really want brown eyes like dark chocolate brown. I do have glasses so I would prefer to get prescription ones but I don't mind if they aren't. I would like fairly cheap comfortable lenses though I can be a bit flexible on the cheap part.

How much would they cost? How much more would they cost if they were prescription ones? Would I need to go to the opticians for them to make sure my eyes are fine for contacts?

I have had circle lenses in the past but I didn't like the size of the lenses (they were 15mm) so nothing too big please. Links would be appreciated:) Thanks xxx

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