Please read our FAQs at the link below. For $500, you can get a lot of professional treatments done nowdays and remove the hair permanently. There are lots of Groupon and other specials (you do have to verify that it’s a reputable clinic with a good laser first) for as little as $20 per treatment for underarms and as little as $50 per treatment for bikini. You’ll need about 6 treatments on these areas spaced 8-12 weeks apart.
Type of laser depends on your skin type. You also need to make sure the clinic is aggressive with settings. This is all explained in the FAQs.