Okay, so I did a little comparison shipping. Between:

• http://www.puritan.com/pages/file.a...PID=319&PID=498
• http://www.wonderlabs.com/newshowit...itine&offset=10
• http://www.swansonvitamins.com/weba...null&Ntk=Level1
• http://www.doctorstrust.com/item/DT1401-5.html
• http://www.americannutrition.com/sh...46b6bb590f3a4f0

It seems that for a supply of 500 mg tablets, Doctors Trust 240 count for $25.99 is the winner for the price / pill. I think I worked it out all correctly. Not including shipping.