Where can I find good, reliable Drupal freelancers?
A lot of generic freelancer site members may have used Drupal but usually work with anything, wordpress, joomla etc. Drupal has a fairly high learning curve and to get the best out of it you would be best with a Drupal Expert. Maybe try something closer to the Drupal community. 

Using a Drupal resource for Drupal freelancers might provide more Drupal expertise...

http://drupal.org/paid-services 
http://drupal.org/marketplace-preview