The links you need are all in this thread:
http://www.poolforum.com/pf2/showthread.php/17055

The best place to get dichlor, if you have access is to buy the PoolBrand products at Sams Club. Amazon is 2nd choice, but better than buying locally, since almost all dichlor is now blended with 'mystery' chemicals, some of which can cause real problems with your pool.