Alright, Amazon sells things really cheap. However, some people can't use it for one reason or another. So someone should help them out.
All someone would need is an Amazon Prime account, so shipping is free. Also, a fairly high limit on the old credit card would help. Now you can order whatever anyone wants. Now you just need to find someone that wants something, order it for them, and charge them the price of the item plus 5-7%. Now they are getting what they want, likely cheaper than could be had elsewhere, and you are making a small profit.
Now one or two transactions like that won't be much money. So you need to go somewhere with lots of people that can't use Amazon normally. Either a bad neighborhood, or a retirement community would be good. Both would have lots of people that ignorant of computers, or don't have the internet, maybe don't have credit cards, or whatever else that might prevent them from shopping online.
So find a place, start taking orders, and then come back the next week with the merchandise. If in a bad neighborhood, get the money upfront.
*I have never used Amazon. All of this is based of what I have heard about Amazon.