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Actually, the validator is here [validator.w3.org].
Given that the prices range from low-end to high-end and no matter where your personal economics are, odds are there's one out there for you.
All you gotta do now, is find it.
Pendanticist.
and your CSS at: [jigsaw.w3.org...]
Definately worth doing. It will find all sorts of tag typos, nesting errors, things opened but not closed, or closed in the wrong order, warn you about browser specific code, wrong value attributes, attributes with missing quotes, missing MIME types on scripts and styles, and a whole load of other useful stuff.