Bathroom Remodeling

Remodel of a very small 4 piece bathroom. Need new vanity, toilet, and replace existing tub/shower (potentially adding new tile or new bathfitter-type surface behind the tub), and flooring. Nothing too fancy, and not changing the exisitng layout or function of the room. Ready to start anytime. Want to find the most cost-efficient rennovation, and would be willing to shop for/provide my own materials (new toilet, tub, tile, etc.) and pay contractor for labor only if that is more cost-efficient for the project.