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Mobile agents have been advocated to support electronic commerce over the Internet. While being a promising paradigm, many intricate problems such as security and fault tolerance need to be solved to make this vision reality. In this paper we have proposed a fault tolerant comparison internet shopping system BestDeal. We assume that both the mobile agent and the host responsible to execute mobile agent are test worthy and mobile agent does not get tampered, kidnapped or robbed on its way. Hierarchical Fault Tolerance Protocol (HFTP) has been used to make this application fault tolerant i.e. user, who launches the mobile agent receives it back with correct result within time limit in spite of hardware and software faults such as link failure, host failure, or crash of mobile agent or mobile agent system. Proposed protocol has been modeled by using CPN tools and been analyzed by using simulations and data gathering tools.