Answer:
1. Dependiente. This is an interesting word, because the more literal translation is "dependent", meaning someone or something that depends on someone or something else, but regionally and in the right specific contexts it can refer to the person in charge of sales and the register at a store
2. Regatear. This means to "bargain"
3. Caja. The literal translation is box, but in sales or money contexts it can refer the "register box", from the full term "caja registradora".
4. Barato. This means "cheap"
5. Azul. This means "blue"
6. Gafas de sol. Just like in English, this is a composed term from "gafas" (glasses) and "sol" (sun). However in Spanish it's not common to mix two words into one to make a new one, so we say "gafas de sol". Outside of Spain, "lentes de sol" would likely be more common but still understood.
