I give one of my guys subQ fluids regularly and I order my stuff off the Internet (because it is sooooo much cheaper than at the vet's office). I also have my local Target pharmacy order the fluids in by the case lot (so I only pay $21 for a 12 1-litre bags of lactated ringers solution).

I was also talking with a friend of mine who was having the same problems with the insulin needles for her cat. You might want to see about getting a different lot number of needs (it will be marked on the packaging).

But prayers are coming your way