Sounds like the situations you are all facing are very tough.
At our centre we have an extremely stingy owner, even extra wipes/tissues/gloves/toilet paper are under lock and key, so if the director is not there and we need something it's frustrating.
However as a team we have come up with various fundraising ideas and have done these off our own backs. We now have a camera for every room (from fundraising), a computer for programming (donated by a parent), a multi function printer and can afford ink to print everything with(from fundraising).
Another suggestion is to ask parents if they have computers or cameras they no longer use - many parents will donate if they've upgraded...
If there is no way but to buy I would try to find a cheap camera (under $100) then ask to speak to the store manager, explain that they are for a childcare centre and that there is not much money for resources and ask for an additional discount - worth trying, worst they can say is no.
I have done this before with a computer store and been offered 50% off everything we purchase

).
Good luck.