There's no need to pay $30 for that salt scrub by Origins. Just mix enough salt and sugar with any oil, particularly jojoba, and exfoliate away!

Also, a great, inexpensive product for oily/blemished skin is Milk of Magnesia! Yep, the constipation medicine. Buy the original, unflavored kind. Apply thickly as a mask; it can absorb more oil than clay masks, it gently disinfects, and calms redness and irritaion. Also apply a thin, sheer layer with a cotton ball it the mornings to mattify you skin. It works better than Clinique Sheer Mattness, and is really, really cheap.