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We consider price competition among multiple primary users in a cognitive radio network with multiple secondary users. Each primary has unused bandwidth with some probability, possibly different for different primaries, which he would like to lease to a secondary. For the case in which all the primaries and secondaries are in a single location, we explicitly compute a Nash equilibrium (NE) and show its uniqueness. Then we consider the game with spatial reuse of spectrum, and for linear conflict graphs, explicitly compute a NE and show its uniqueness in a natural sub-class of NE.