There are a huge number of bearded dragon breeders out there, due to the expense of buying them.
Whilst tremendously popular, the bearded dragon has kept it's value and so it can be quite
financially rewarding to be a bearded dragon breeder.
You could search on my favourite reptile classifieds but the only real problem with this is
that many of these are amateur breeders who will not ship the bearded dragon to you - you may have a long drive to go and
collect it.
Alternatively, you could consult the livestock lists of one of the professional dealers online such as this one.