I have occasional spray tans, normally before weddings when I have no choice but to front up in wedding guest gear. I pay £15-20 always at the same place, price seems to be quite random as I think it's a treatment that is regularly on offer.
My regular beautician is a very very tiny lady. I am not a large dress size but am very tall. I actually go somewhere else for my spray tans as I know I would feel like an ungainly giant with her and would find it hard to stand in front of her in a pair of paper pants, hoiking up my boobs to ensure full coverage. I get mine done by a lady at my hairdressers instead and had weighed up first that she was unlikely to make me too lumpish - maybe something to consider if you might feel self conscious.
I've never ended up going orange. I have that very pale Irish colouring and always ask for a light touch. Usually it's just enough to lift me from corpse to tiny healthy glow. I think you should be able to specify colour.