Cheapest way is to use two cheap manual only flashguns such as Yongnuo, plus optical triggering from your camera's pop up flash if it has one, else triggered from a sync cable with a Y splitter from your camera's sync socket, if it has one.
The power button, if you mean to just trigger them probably some yongnuo rf603's, if you meant to trigger them and control the power we'd have to know what flashes you're working with.
As per Phil's post above, I use a yn560 with yn603 triggers this does not give ttl it is all manual.
Have just bought the yn622s which give ttl with the yn568 or my sb800.
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