Right, I wasn't talking about actually making sales online - I was thinking that Google Shopping shows an option for "Also available nearby," Depending on your area (how long does delivery take, what other stores are within 20-50 miles, etc.) and what sorts of things you stock, it might be possible to be the "desperation destination" for some items that might be things you keep on hand anyway like power supplies.
Looking into it, it seems like Google Shopping is actually part of their advertising system, there's a link to Information for Merchants at the bottom of the page. I have no idea whether it'd be worth the time, expense, or time expense to actually get involved in this and the more I think about it the more I think "probably not at your size unless there's nothing else around."
One other thing that jumped out at me since I think you said you were looking for a bigger shop - are LAN parties still a thing or did they pretty much disappear once people got better Internet connections? If they are still a thing, having a space where you can host them might bring in people inclined towards impulse buys of gaming mice, keyboards, cases, etc.