I have dealt with them. They potentially could be flippers, but they usually hold onto the tortoises for a few weeks to make sure they are healthy. The tortoises i have bought from them in the past have all been great. I have bought some high end tortoises such as angulated (bowsprites) and high marbling cherryheads. If they are flipped animals, they were at least healthy. At the end of the day, that’s all i care about. Hope that helps.
I'm pretty sure that any reseller can be called "flippers".
Certainly the shop I previously dealt with in selling my baby Redfoot meet that criteria.
The trick I guess is to find a flipper that offers good customer care and actually cares about the animals that they sell. Since very, very few reptile outlets seem to actually breed their own tortoises.
Actually breeding their own tortoises would give them much more of an incentive to house them better it seems to me.
And while I CAN say a few words about several reptile sellers here in Florida, I've had no dealings with Snakes at Sunset.