It depends on what you’re looking for. I spent around $450 on a pair of Aphrodite forms when they were on sale. I wanted forms that were very realistic, had a self-adhesive backing, could be worn braless (with stronger adhesive), and were safe to sleep in. The Aphrodite’s were the only forms at the time that checked all the boxes.
My understanding is the recently added Hera forms are an improvement on the Aphrodite’s (same manufacturer). The Breastform Store has frequent sales so you should be able to get a better price.