Are we talking about bypassing or decoupling here? For bypassing, when you have fairly large values of capacitance, 10-100 uF, film or non-polar caps can be exhorbitantly expensive, and may not even run up to those values. Try looking up 100uF film caps at Mouser or digikey, and tell us what you find! As for decoupling op amps or other smt chips, where low values of capacitance (and impedance) are needed, I don't really understand why you would use film caps either. The best caps for decoupling have low impedance, and those are surface mount C0G or X5R, preferably 0805 or smaller placed as close as possible to the supply pins - not bulky through-hole film caps. Yeah, they may look better - but they don't serve the purpose as well.