Casas de cambio (exchange offices) are open longer hours and at weekends, and have varying exchange rates and commission charges; they also tend to have shorter queues and less bureaucratic procedures. They usually give better rates than banks, but it's always worth checking, especially if you're changing travellers' cheques. Occasionally, casas de cambio give rates for Canadian dollars, sterling and other currencies that are as good as those they give for US dollars, so again it's worth shopping around, especially if you intend to change a large sum.
If you're desperate, many hotels , shops and restaurants that are used to tourists are prepared to change dollars or accept them as payment, but rates will be very low. There isn't much of a black market in Mexico since exchange regulations are relatively loose, and it's not really worth bothering with unless it comes about through personal contacts or you want to do someone a favour.
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