I have had months where I pulled more than 20K on ebay. I mainly move high end art work and precious metals but getting to a profit margin on these things takes time. I started with one painting and from there traded up to more. Over time I have put together many great works of art which I can sell when times get tough. In precious metals you can do well too but it does take a sizable investment and knowing when to buy and when to sell. The smartest move to make money quickly on ebay is books. If you live near a college simply run an add in the school paper that you buy books. Most schools buy back books at 15% of the sale price, you simply offer 25%. From here, use your phone to scan the ISBN code and it will automatically list the book for you. I have seen text books go for a lot of money and there is an endless supply of them. I live in a 5 college town so if I wanted to get a hustle going it would definitely start with school books. Another awesome hustle is buying computers and filling them with all the best software, music, movies, games, etc and reselling them. I used to do this without even having the product in hand, I had hard drives already filled with all the software, when someone would buy I would then go and buy the computer, swap the drives and it was a wrap. A computer that costed $2500 I could get $4000 for once all software was installed. All good hustles and can make you far more than $300 a month.