Unscented tanning lotion is available but not easy to find. Most lotion companies add scents to their products because the active ingredients tend to have a slight scent. To make this fragrance pleasant, they put additives that make the lotion smell good.
These are fine for a vast majority of people, but some get irritated by scented items. Allergies do exist for certain scents and moisturizers. If this is a problem that you have, there are certain lotions that will accommodate your needs.
You can find unscented tanning lotion at many places. This includes many retail stores that carry tanning supplies. The selection in stock is going to be limited because this is not a volume mover.
If you are having problems finding this certain type of lotion in stores, you should try online. The internet is home to hundreds of lotion retailers. You are guaranteed to find the lotion that you want for the price you can live with.