Way too much $$ new.
Check
www.labx.com or
www.ebay.com for used flowmeters. Try and get one that has been calibrated recently.
You will be able to find digital flowmeters that output 4-20mA signal. Then buy a an LED display (called an indicator I think) to convert such to flow rates. Should be under $50 for both if you are patient.
The dwyer stuff looks nice though. I have a GPI paddle wheel type.