Usually, IaaS providers use the inflexible supermarket approach for trading resources: a provider offers a resource for a fixed price. Consumers can buy the offered resources without negotiating with the provider. That's why the supermarket approach is called take it or leave it approach. Auctions can be used instead of the supermarket approach. Auctions are a way of determining the price of a resource in a dynamic way. Additionally, auctions have well defined rules such as winner and loser determination, time restrictions or minimum price increment. These restrictions are necessary to ensure a fair and transparent resource allocation. However, these rules are limiting flexibility of consumers and providers. In this paper we introduce a negotiation based resource allocation mechanisms using the offer-counteroffer negotiation protocol paradigm. This allocation mechanisms has similarities to the supermarket approach as consumer and provider are able to communicate directly. On the other hand, the approach has similarities to auctions as the price is determined in a dynamic way. We created a Bazaar-Extension for CloudSim which is able to run negotiations. New negotiation strategies and market scenarios can be developed and simulated with the introduced Bazaar-Extension.

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