I'm a Muslim brother. I'll do you a favor and take your stuff off your hands for free :p.
I've gotten "Muslim brother discounts" at pizza places and even at some halal stores/restaurants. Though I guess it has more to do with me being regular/known by someone at these places rather than just being Muslim.
There was this halal pizza place that gave us a discount on their pizzas since we bought them for some masjid function. Some people also tend to give us discount if we're buying the food for jamaats.