Where can I get water flow meters?

[NaughtyusMaximus]

I need ~4 small (for 1/4 inch inner diameter pipe) flow meters for a fuel line, and have no clue where a normal consumer might be able to purchase them. I'm not looking for top quality or anything (in fact, the cheaper the better - as long as it is decently accurate, etc..).

Can anybody help me on my search?

 

[Eli]

Check McMaster Carr'ssite.. under Process Control and Instrumentation.. ..


Flowmeters and Totalizers.

They seem pretty spendy, though.

 

[NaughtyusMaximus]

Too rich for my blood.

I could have sworn I saw some cheap ones on some watercooling sites a while back, but I can't seem to find them anymore. Wire leads for the signal (so I can hook them up to a laptop) are also a requirement. (Just so that I could make my chances of finding the piece easier...)