We have a set price list for different types of oven.
We don't like the idea of saying "prices from". All too often people are lured in, only to find that there are all sorts of extra charges and you end up paying a lot more than you thought.
Our prices are completely transparent and include oven shelves / wire racks. The only extras are grill pans / trays and oven bulbs, and these are at your discretion.