If you're interested in purchasing an internal vibrator, there are a few things to consider to help you make an informed decision:

1. Type of vibrator: There are different types of internal vibrators available, including G-spot vibrators, bullet vibrators, rabbit vibrators, and more. Each type has its own unique features, so it's important to research and determine which type is right for you.
2. Size and shape: Internal vibrators come in a variety of shapes and sizes, so it's important to choose one that is comfortable and fits your body well. Some internal vibrators may be curved or angled to provide better stimulation, while others may be more straight or cylindrical.
3. Material: Internal vibrators can be made from different materials such as silicone, plastic, or metal. It's important to choose a material that is body-safe and easy to clean.
4. Vibrations: The strength and type of vibrations can vary between different internal vibrators. Some may offer a range of vibration patterns and intensities, while others may only have one setting.
5. Brand and price: There are many brands of internal vibrators on the market, each with their own features and price points. It's important to research the brand and read reviews from other users before making a purchase. Additionally, consider your budget and choose a vibrator that is within your price range.

Overall, when buying an internal vibrator, it's important to consider your personal preferences and needs, as well as the features and quality of the vibrator.