Controlling 4 pumps with variable flow rates


I need to control 4 pumps, each with variable flow rates. Preferably I would use 4 cheap pumps like this: Peristaltic Liquid Pump with Silicone Tubing - 12V DC Power : ID 1150 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Any help would be much appreciated

Something like this:
Or, if you are capable of soldering, two of these: