Should be using this anyway, but here goes ...
When you shower, wash your face and neck with Clinique Face Soap (about $12).
Shave in the shower to keep moisture in.
Follow the shower up with Clinique Exfoliating Tonic (about $14.50).
Then moisturize with the product of your choice (I like Clinique Broad Spectrum SPF 21 Moisturizer - about $27).
The soap should last at least 6 months if not longer. The Tonic probably lasts 3-4 months if you use it twice a day like they tell you. The moisturizer I use sparingly, but it should also last 3-4 months for the average person. So probably ~$100-150 a year.