To me that seems very low priced.

That would be the door only, no frame, no hardware, no prep, and even then it is still way to cheap for any sort of quality product.

Running it thru the options as we would normally order doors, prehung w mahog jamb & trim, hinges, threshold and bored for locks is $1400+ without shipping. Not a bad deal for a 3068 exterior door. Some big box stores have entry doors from $500-800.