So there we have it, the advantages and disadvantages of both business models. If you have the time and willpower to go around local stores and search for FBA deals, then it can certainly be rewarding, however the trend is leading towards Online Arbitrage becoming the defacto FBA start-up business model as it’s just much easier and vastly less time consuming than retail arbitrage. Online arbitrage is a great way to add a side income to your full time job.