Parts list

There is the freeware version of FreeLSS that you can download and install.  You can also either purchase a software license for the full version ($25) or purchase the hardware + electronics kit at http://store.murobo.com.  Since the basic circuit design is available, you can also make your own scanner board and source the other parts (e.g. lasers, stepper motor, driver, power supply).  I went and sourced all the parts myself since I liked the PiClop design (a cross between the Atlas Pi-powered scanner and the Ciclop Arduino-powered scanner; look for PiClop on Thingiverse) and made my own board (see attached).

Red line lasers are fine ~ 5mW 5V red laser (650 nm) - the size depends upon the clamp, for some it is a 12 x 30mm line laser.  It depends on what you want to build.  You can also run a 3.2V laser at 5V and it should be okay.  Aixiz sells them for $6 each.

Stepper motors can either be 0.9 or 1.8 degrees (You would only need to adjust the steps/turn).  The height is important to consider regarding the design you use (e.g. the type of turntable and tower).  For the Piclop, I am using a 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase stepper motor that I purchased from Pololu.  I have assembled scanner boards if you are interested.