The price of a comforter depends on several different factors. Comforter size, construction, outer fabric, stuffing material, and brand all impact the cost. For instance, down is almost always the most expensive filling, and a king or California king size comforter will cost a whole lot more than a full or queen. Based on its features, construction, size, filling, and material, you can expect to pay anywhere from $70 to $600 for a quality comforter.