Small speakers for retail store

Looking for recommendations for small speakers that can be wall/ceiling/shelf mounted or placed inconspicuously for use in a retail store or coffee shop (think "Starbucks" or about the size of a large living room) for background music (but still looking for as good quality as can be had for the budget, something non-fatiguing to play all day).

Budget in the $300-500 range, recommendations for used ok but would like some options for new as well.