Upon completion of its deal to buy T&S, Tesco wants to sell 330 Dillons and Supercigs CTNs.
The Co-operative Group is also widely expected to dispose of some Alldays stores following its acquisition of the chain.
Christie and Co buys and sells on behalf of Alldays, T&S and the Co-operative Group.
Director Mark Sheehan said: "The convenience market is suddenly very fashionable. Stores that come out will be good opportunities for smaller operators, not impacting on value."