Hey, I've looked into this kind of stuff myself recently. The take away that I've got is factor in how much you want to pay yourself per hour, divided by how many you can make in an hour. Then factor in your overhead and divide that by how many items you expect to sell in a month (sell yourself short here). Finally, factor in the cost per item to make. Once you add those up, multiply by three, and you have your asking price.
So lets for example, you want to pay yourself $20 an hour and can make two an hour. Lets say your rent, permit fees, credit payments on equipment and supplies, and all other business expenses add up to $100 a month (if it something costs you anything, include it in this part of the equation) and you think you can move ten items a month. Then lastly, lets say it costs you $1 in materials each to make these. It would cost you $21 per piece to make, so your selling price should be about $65.
Also . . .
Additionally, any suggestions for video games/pop culture things that might be of interest to people?
You should probably avoid selling stuff involving other company's IP, to protect yourself from any nasty lawsuits. Besides, you're a creative guy. I bet you could come up with tons of cool, original stuff.