I'm just going to use one etailer as an example; from Direct Divers.
Mares X-Vision Liquid Skin Mask.....................$90
Mares Pure Vision Mask.................................$60
Cressi Matrix Mask.......................................$60
Evo Equinox Mask.........................................$60
Evo Breeze Purge Snorkel..............................$15
Mares Volo Power Strap Fin...........................$160
Mares Quattro Power Full Foot Fin...................$130
Mares Avanti Quattro Strap Fin.......................$130
Mares Super Channel Full Foot Fin....................$70
Cressi Reaction Strap Fin................................$90
Tusa Imprex 5mm High Cut Booties..................$40
Evo Classic 5mm High Cut Booties....................$30
Adding the high price items together is $305 before shipping (and tax if you are in Florida).
Mid price strap fins with cheaper mask and booties is $235.
With the Super Channel fins the low end is $145 (no booties).
Please note; I included no reef grabbing gloves in my packages.
Adding gloves and buying all Scuba Pro would bring the typical price up to at least $400. Depending on the items, the price could be a fair price. Whether it is the right choice of gear for you is up to you to figure out.