Embodiments of the present disclosure are directed towards a bullion arbitrage kiosk portal device that enables a customer to buy and/or sell precious metal bullion. A price for the bullion is dynamically determined based at least in part on a plurality of real-time market quotes, an operational markup, and an inventory determination of bullion at a single or multiple number of kiosk portal device(s). The kiosk portal device is further configured such that bullion purchased by the kiosk portal device may be resold by the same kiosk portal device, thereby integrating the buy/sell of bullion, even by the same customer. The kiosk portal device further enables a customer to exchange bullion for differing configurations and/or amounts of other bullion, as well as other forms of payment, such as cash, credit, or alternative denominations of bullion.