Low-cost aluminium rims

Hi, so far I always had summer tires on the factory rims and winter tires always on steel rims. That’s why I have no idea about Alu rims. With me now after vehicle purchase (Audi A6 4F 2.7 TDI Avant, tires 225 x 16″ the purchase of winter bikes (tires + rims). I plan per steel rim with 25€ plus wheel cap for 10€. Now I wanted to see if it is possible in a similar price region to get also aluminum rims. Do aluminium rims differ in quality? Or is the price determined by the look? I don’t really care about the look, but aluminum rims would be nice Thanks, Bernd