Liposuction on your thighs will cost about $4,000 and about $3,500 for your buttocks, if done in a separate procedure. Combined, the cost will be lower.
Contrary to what another person has said in an answer, you should be very wary of travelling overseas for any type of cometic surgery. There is a strong need for follow-up, there is a risk of post-surgical infection, and you could use the support network of friends and family nearby. You don't want to be thousands of miles from home when you're recovering from surgery. Also, the certification standards of overseas facilities and surgeons will differ from those of your home country.