You can make "the worlds cheapest ball pump" this way:
1 - shave your pubes down to nothing.
2 - wash out an old pickle or mayo jar, something with an opening at least 3.5" across. 4" is best. (or use a SunTea jar!)
3 - lube the opening of the jar, and your crotch, with hand cream.
4 - stuff your bits inside the jar, along with a length of rubber tubing, and press the jar gently against your groin to form a seal.
5 - suck air out using the rubber tubing. You'll feel a vacuum forming.
6 - once you feel a nice suction, slip the rubber tubing out
7 - sit perfectly still for 20 minutes.
8 - repeat as desired
Instructions on how to convert a SunTea jar for pumping are around on many sites.
Now, don't say you do't have enough money to get into pumping
Enjoy!
Russ.