Under 4$ a box if you buy in quantity and at dealer prices [ our club puts in a order from a wholesaler]. Even at higher prices, if you reload you can tailor your loads to what you want.
www.circlefly.com sells felt and fiber wads.
www.precisionreloading.com sells good metal roll crimpers- think they're on sale this month. Claybusterwads and Downrange sell 16 gauge wads - and you'll want to reload for 16ga- they're too expensive to buy. Buy a used Mec 600jr to get started reloading. Our reloading forum is helpfull.
www.shotgunworld.com also has a very helpfull reloading forum. Alliant and Hodgdon powder companies have web sites for reloading data. For a year or two with myself, wife, daughter, and granddaughter all shooting, I was reloading about 30 boxes a week. Now it's just me and the wife shooting between 16 and 20 boxes a week. I sure couldn't afford it on retirement money. Plus, as I said, I can put togeather the loads I like without having to shop for special loads or pay the high price. I've made 2" to 3" shells, roll or fold crimp, light target to hunting loads, paper wads or plastic, nitro or blackpowder, 10ga to 28ga all right in the basement. Maybe a friend who reloads can help. Have at it, it's fun shooting with loads you made yourself.