Amazon MP3 has a lot of really good Latin albums (most of which I already own) on sale for $5.99. 

Recommended: 

• 1977 - Ana Tijoux (rap)
• Otra Cosa - Julieta Venegas (pop)
• Blow Up - Bomba Estereo (pop)
• Dulce Beat/Cocktail - Belanova (electronic)
• Donde Jugaran Los Ninos - Molotov (rap/funk)
• Bajofondo Tango Club - Various (tango) this one I didn’t have but do now!
• Malamarismo - Mala Rodriguez (rap)
• Chancletas y Camisetas Bordadas - Los Rakas (rap) also just bought - new, too

Songs that are 69 cents that are awesome: 

• Caraluna - Bacilos (rock)
• Gimme tha Power/Molotov Cocktail Party - Molotov (rap/funk)
• La Vida es un Carnaval - Celia Cruz (one of the greatest salsa songs EVER)
• Volverte a Ver - Juanes (pop)
• Me Pregunto - Belanova (electro)
• Volvere/Por La Noche - Mala Rodriguez (rap)