Most clippers will last you 12 to 18 months if you oil them properly (at least every third use if you're the only one using them, every use if someone else in addition to you uses them). I also brush mine off with an old toothbrush after every use. Most brands of clippers sell replacement heads in beauty stores (Sally's) If that doesn't work, you may have to bite the bullet and buy another set. I just bought a set of Andis for $54 and the last one I bought was in 2008. My clippers on average with proper maintenance can last about three years.
