I run a local video games store and I get many used items all the time. I usually buy them for 1/3 of the market value and then sell them back on ebay at market rate, but I'm looking to outsource the selling part. I'll just acquire the items and ship them out. Obviously I want to only work with reliable sellers with good feedback. I actually have a in-house system built for tracking/buying these used items and can let sellers in to see what they would like to buy. I was thinking of just taking Bitcoin as a form of payment before I ship the items as its the closest thing to upfront cash without the risk of chargeback or scams. Is there a service for something like this already?