Folks, I need help. Does anyone have access to, or know how to access, basic medical supplies in small quantities? Everything I can find is a box of 20 when I need ONE! If I buy a huge box of each part, the price gets crazy fast, and without being able to play with the parts, I don't know if what I order will actually work.

Specifically, I'm building the injector pump for the reagent, and I've found designs that look pretty good using a servo to open and close a syringe, which would be hooked to a reservoir with two one way valves. The medical community calls them "back flow preventers" and they connect together with something call "luer loks". Also, there are curved hypodermic needles that would be perfect to deliver the reagent to the reaction chamber.

I need:

• 1 small syringe that moves easily,
• 2 back flow valves, one between the reservoir and the syringe, one between the syringe and the needle.
• 1 curved needle of a very large bore, and
• some means of connecting all that together and to the reservoir. I assume if they are all luer lok parts, they will all hook to each other already.

Here is a link to a very basic version (no reservoir or valves or needle) of the injector design I've selected:

http://www.thingiverse.com/thing:219281

Help?