Doc Wong's clinics deliver some good essentials. You could take those and with continued riding become quite proficient. This is your cheapest option and probably best if your at a beginner level. Shane Watts driils you thoroughly but it won't leave you with enough skill to keep up with the second part which is a trail ride through some single track, rocks and hills if you are at beginner level. Best recommendation I would give is Jimmy Lewis, but he's farther than your listed range. Then there is Rich Oliver's Mystery School which I have not done. Also, Phil ran an school at Sand Hill in Brentwood which he used to own but I believe he sold the property and is now doing some classes out at Carnigie. He teaches some good basics . Kind of a MSF for dirt bikes. He is not Mr. Personality but is OK.
Qui Desiderant Pacem Preparate Bellum
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