You can go to your local Navolty shop and buy them for $60
You'll need to get your suit about 3 months before comp if you're having it specially made. You should work with someone who works with professionals so as you diet down, you can feel comfortable in knowing your suit will still fit you.
You'll also need to decide of federation you feel comfortable with. Try attending some figure competitions to see the dif. in style, etc.....