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Side steps as well as many other items can be sold in two different ways.
One, as part of the MSRP and they are on the MSRP label. These are known as RPAs, and now they are installed by an outside firm for most dealers. The price for install and the part are figured into the MSRP of the vehicle.
The other way is to sell them as a dealer installed accessory. Sold this way, the dealer can charge whatever they please for installation and the part.
Remember, the dealer if they installed the item, paid a technician to install them, and would have to pay the technician to remove 'em. Technicians don't like to work for free.
If they are a dealer installed accessory, noted by label other than the MSRP label shipped from the plant, make an arrangement to pay for the installation and removal, but not the part.
Or, have the dealer locate the exact vehicle you want.