Is there a way to get more needles that fit the Badger 175 aside from ordering them online? Also, are there more needles that got the 175 other than the three (small, medium and large) that came with the airbrush?

These guys have the needles for less than $5 ea.

Coast Airbrush::Badger 175 Parts

Chicago Airbrush::Badger Crescendo Parts

You could also check Bear Air, Dick Blick, Amazon or eBay. There doesn't seem to be any scarcity of available parts.

As for other sources that are not on-line, I think that only you can know what possible stores in your local area might carry AB parts. The vendor that sold you the AB might be able to order the parts.