Cheap but still decent Laminar Flow

Hei there,
I wanted to build my own laminar flow. I only found not so serious project on Instrucatables. Any suggestions? Or in case where to buy a cheapone?

there is some ancient documention on the hackteria wiki by our friends in Bangalore…
https://hackteria.org/wiki/DIY_Sterlisation_Hood

we might wanna look into getting a 2nd hand somewhere cheap. @gaudi ? any resources?