I would try a dealer that sells mostly
safety equipment. In Connecticut there is Landfall
Navigation. I am sure there are dealers like that in South
Florida. Also, if not needed immediately, go to one of the larger
boat shows like
Miami or Ft Lauderdale. There are always vendors that will have demo
equipment you can try on, and also, might let you inflate it, even if done manually. If your not comfortable in it, you will be less likely to wear it.