Hey there is an ultra cheap way too! First, if you notice a beam is a good deal smaller near the laser, and even the best will spread out as they travel. If you have a mirror with a small spot of the reflective stuff removed, arrange so that one beam reflects (and is aligned with the second, very near the one that passes through the "hole" in the mirror, as they spread, they comingle! Also, you can use similar arrangements on a mirror's edge too! If you need a diagram, I'll email one later, but this has to be the cheapest way to combine beams! -Glenn