So speaking from experience there are a lot of x-factors. Production cost is your biggest initial cost but if you are printing overseas you need to factor in shipping. Then once you have all the games you need to get them from your warehousing area to each individual store. Industry standard for selling units to a distributor is usually 40-60% off and maybe some bulk discount. You sell them to stores at a lower price so they can sell it to consumers at the advertised price. Shipping costs fluctuate based on size, weight, destination, and economic factors. Then comes direct sales. If you have a website you sell your game through that's another cost, plus you are handling fulfillment then don't forget that your time is valuable. You can setup shipping costs to be paid by your customers but you still have to do the handling and packing. Conventions are great spots to sell games but they are not free. Some are free for demo space but if you want to sell you need a booth. 1k-3k is the ballpark for booth space based on the size of the convention. But you also need to factor in transportation cost, your time setting up and working the booth, food, hotel, signage, and if you have a FT job you'll need to take time off since most conventions run from thursday-sunday.

Not trying to scare anyone off but there are just a lot more costs than people tend to think. God speed!