Cap Barbell makes some decent, inexpensive fixed Kettlebells. You can find them on Amazon or Walmart (Website, ship to home/store). They’re pretty much bombproof, as most fixed iron or steel bells are, so I like to use them outdoors or when I’m teaching group classes.
Personally, I really like using Cap’s Adjustable Kettlebell; it adjusts from 20 to 40 pounds in 5 pound increments; currently (09/2013) find it same place as above for $150-$180ish. It’s shaped much like a competition kettlebell and remains the same shape regardless of weight. It also works great when training clients in their home as you don’t have to lug around multiples.