How to make a (cheap) reaction with a specific liver enzyme?

[X-Flix]

What would be a cheap experiment setup to test the activity of liver enzymes?

The Substrates to test their activity shouldn't be a problem. I'm asking more about the way the enzymes could be prepared. My research on the web has shown so far , that most studies used microsomes (that are too expensive for me to produce/order). I wondered if it could also be done with a thin slice of liver or an other kind of setup like this.

Note: As I am asking this for a school project the equipment should be cheap/already available at school. If there is no "cheap" option, which I suspect, then I would still be interested in the setup.