Edit:
Mission accomplished! Thanks to all, including several people from other groups, for the advice and support.
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I need guidance regarding purchase of a dependable, used, mountain bike.
One of the veterans who will receive gifts from Yavapai County Christmas Angels has asked for such a bike to use as daily transportation to and from a job.
Can anyone advise me as to which retailers are most likely to give me good guidance and offer what this veteran needs at a fair price?