It's a bit hard to advise you without knowing what area you are in or what might be in stock in your local store. You should be able to get a iStick Pico under that price, but finding one in a store without a tank-- that is not in a kit-- may be difficult. Even if, you should be able to score a kit within your budget and you can just throw the tank away if you don't want it. The Pico is a removable battery mod. For fixed battery, take a look at an Innokin Kroma, although those are usually sold as a kit also.
Why don't you go by the shop, take a look at what they have, and either buy whatever looks good to you, or note it down and ask us questions about whatever you're thinking of?