Should you ever need a haircut in South London, you would have the option to choose from a wide array of African hair stylists. There you can get your hair colored, cut, or braided, while chatting up the latest gossip in town, and... you can send money back to Nigeria.
Many stores in South London allow you to send money abroad. It looks just like a fruit market, where the sellers have to compete among each other. Aside from trying to lure customers in with the best looking apples and pears, they also keep their prices exposed.
But the world is not... ("...enough" you are thinking, if you are a James Bond fan) ...the world is not South London and remittance services are not crispy apples nor they are juicy pears. The price for sending money might include a fee, taxes, a margin on the exchange rate applied, and a commission to the receiver. And each service is different in terms of speed and extensiveness of the network where money can be picked up by the receiver. In other words, it is not as easy to compare as the price of apples.