Melissa - I have taken the Lifetime Fitness (it's a gym)-brand metabolism booster/weight loss aid called "LeanSource." I really liked it, although I couldn't quote you results off the top of my head - I fell off that wagon about the same time I stopped being POP and have since gained back everything I lost while I was taking it...but anyway...you can read about it and order it on their website www.lifetimefitness.com (go to "Shop Online" at the top,). It's $27 plus shipping for a 30-day supply (4 capsules a day, if you only took two it would last twice as long ), and if you join their "auto-ship" program you can get it for as low as $21 (have to buy a 3-month supply to get that price).
The two main "active" ingredients in the LeanSource are CLA (can't think of what that stands for at the moment, if I ever knew) and Chromium, if you want to look at metabolism boosters at a GNC-type store, those are the ingredients you should look for. (The LeanSource also contains a "patented micronutrient" that "stimulates thyroid activity and boosts metabolism blah blah blah..." )
Fiona