This paper proposes a mobile negotiation agent embedded hybrid online purchasing system (MineAgeHops in short) with three emphases: agent?s mobility, evolvable negotiation model, and hybrid architecture. As in the physical world, a buyer agent can travel to a virtual shop resided in a remote host for obtaining information about a product and directly negotiating on the product with a seller in the virtual shop. Human negotiation is a complex process. The evolvable negotiation model makes effort to reflect different negotiation levels with increasing knowledge and experience as time goes. A hybrid of centralized and decentralized architecture can overcome network bottleneck problem as well as improve purchasing efficiency by enabling agents? mobility and flexibility.