JustAMummy,
Agree with u tt the motor of some breastpump can be reused and the other parts can be purchased separately. But what is the cost? Most mummies claim their breastpumps r still new, and selling at 60-70% of the actual price, and what is the cost of the separate parts, let alone the trouble? In the end, there wont be much savings.
And for manual pump, its not advisable to purchase 2nd hand.