Price range on these pumps varies only slightly from area to area. I believe the cost is well worth your breastfeeding relationship. A rental station would be a hospital gift store, a specialty shop or even on the Internet. To make them as cheap as they are, the motor is just not capable of doing the job. Not all women can respond to the pump.
Some women have no problems at all.
What you are trying to do with a pump is to fool your body to think that the baby is nursing. That is another reason for the better pumps out there. They are made to most mimic the baby s sucking so that you can have a letdown thus be able to pump more milk. Letdowns are very important in pumping. It is normal to be able to get 1 to 2 ounces of milk at each pump session.