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Dobsonian telescopes typically cost $40 - $80 per inch. Even less if you build one yourself (which is not difficult. See http://members.aol.com/raycash/sidewalk.htm)

Equatorially-mounted Newtonians are $50 to $150 per inch.
Catadioptric (or Cassegrain, or hybrid) scopes range from $150 to $250 per inch.
High-end refractors are upwards of $500 per inch.
Chinese-made refractors are closer to $125 per inch. Read reviews before buying.