"Low Cost" is Rels B daydreaming his way out of a city that wears him down. It opens with "Hoy, sueño con que todo cambie pronto" (Today, I dream that everything changes soon) and "Sueño con largarme ya de esta ciudad" (I dream of getting out of this city now). Largarse is a casual way to say "to clear off" or "to split." He wants somewhere "donde la mirada no tenga maldad" (where people's looks hold no malice). The title line is the sharpest: "'Tán cansado' de una vida Low Cost" (They're tired of a low-cost life). He borrows the budget-airline phrase to describe a cheap, stripped-down existence. 'Tán is just están with the first syllable dropped, the way people actually talk.
The second verse turns warmer. He remembers years "cuando la vida era un chiste" (when life was a joke) and lists what money can't buy: "Como el amor de madre, como la lealtad" (like a mother's love, like loyalty). My favourite line is about loyalty to his people: "Que si tú tiras la toalla la voy a coger, pa' secarme el sudor y seguir" (If you throw in the towel, I'll pick it up to wipe off my sweat and keep going). He takes the boxing idiom for giving up and turns it into a reason to keep fighting. That's a clever bit of wordplay.