Are just going to shoot beams, or do you want to do Graphics?
There are some showcards with buildt in beams and some minimal graphics on them. You will be able to controll this by DMX. OK for beams (notice: OK is below good) and useless for graphics. And only TTL.
Price is around 30USD i beleive, and a couple of hours mounting the thing into the projector.
Ask Winni at Goldenstar Lasers. I think they might have this, as they use a lot of them in theyr chaper lasers.
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More projects than time available.
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Just got to love lasers!