This is a tricky one as it depends on what type and style of microwave you are buying. The cost of a mini microwave ranges in between $100 to $600. The average cost of the microwave on the web is about $350, although it can differ from site to site. This is just an estimate provided by us and not the actual figures so do your own research before buying the product. There are different types in microwaves; countertop, over the range and built-in ones. So, the cost is different for all of them. It can range in between $500 to $2000. The cost of these mini microwaves are more in comparison to normal ones. So,choose accordingly.