Skip the gimmicks! Seriously...they will work, for a while but then as soon as you get off of them the weight comes right back. The other downside is that these "supplements" can potentially be harmful to your health. Seriously, if supplements worked and were successful at helping people lose weight would we be a nation of obese people? Nope!
If you've hit a plateau you need to change things up a bit. Are you doing cardio? Try to include higher intensity intervals (if walking, walk one block really really fast, then the next slow). If you're not doing strength training, give it a shot. Muscle requires more calories even when at rest, so when you add muscle you boost your metabolism. If you don't have access to a gym or any equipment at home, google "strength training at home" or go to sparkpeople.com for suggestions.
Have you modified your caloric intake to reflect your weight loss or are you still eating the same amount you always have? For every ten pounds you lose, you should readjust your caloric intake so that you can continue losing. Also, a good way to boost your metabolism is to think of your calories as a week-long requirement. Just using simple numbers, let's say you are to eat 1500 calories a day. That would be 10,500 calories a week. Instead of remaining constant at 1500 calories a day, try eating 1400 one day and 1600 the next day, adjusting from the midpoint. It'll help keep your metabolism firing without dipping below the absolute minimum requirement per day you should consume (never go under 1200!).
Good luck - for lasting success turn to healthy habits you can adopt for a lifetime and not a band-aid approach that may do more harm than help.