While there are countless suppliers of automated external defibrillators (AEDs) and other first aid supplies (like those we use in our classes), we have one favorite supplier: the AED Superstore. They have low prices (generally lower than the manufacturers), they ship quickly (generally overnight), and their service is impeccable.
By the way, we are in no way affiliated with the AED Superstore, other than as a loyal customer. And we benefit in no way from recommending them. You’ll find a link to their website below.