With just a few paint and stencil supplies you could walk the neighborhoods with curbs and solicit your curb number painting services. Obviously, you need to be somewhat handy with a can of spray paint and stencils, otherwise, you might have people coming after you if you mess up their curb. That said, there is a business for this as people are out there making it happen.
This is slightly different than eBay Arbitrage. Find a distributor that will sell to you at their discounted prices. List these items online. Buy and ship to your heart’s content. Basically, you become a reseller of computers and other hardware. Another thought here is to sell computer parts. Can you find a part that seems to be in demand? If you can supply the demand, you may just have yourself a part-time business.
If you’re looking for inspiration, my friend Michelle Schroeder-Gardner of the website Making Sense of Sense has become the expert on all things affiliate marketing. Michelle earns more than $100,000 per month from her blog and the bulk of her income comes from affiliate sales. Michelle has had so much success with affiliate marketing that she even has her own course called Making Sense of Affiliate Marketing.