"I cannot buy syringes with needles in the USA without a prescription from a Doctor."
Wow, I got a whole bunch just sitting here, I find them useful for separating solutions or taking up small amounts of chemical rather than trying to pour into a 10ml graduate cylinder.
Might I suggest looking on eBay for printer ink refill bottles that usually come with syringes + needles I think mine came from HK (you may want to adapt the tubing to a needle and araldite it in rather than use the syringe+plunger).
I can mail you some if you want.
Perhaps we could start some sort of fund raiser?
Anyway, PE, it might be cheaper in the long run from not having to use so much raw material if you get someone to make this stuff (hardware) for you? Someone that builds complex stuff out of their house.. my uncle was building prototype magnetic mineral separating machines for the mining industry out of his home workshop (though there were a few indicents of magnets exploding and putting holes through tin walls, or exploding and collapsing back in on themsleves :P)
What kind of pump are you using? Might I suggest a cavity pump?