Have you been considering a 23andMe DNA test to learn about your ancestors and find out whether you have a genetic risk factor for certain diseases? Go for it now, because it’s 50 percent off for Prime Day.

The 23andMe Health + Ancestry test normally costs $199, but Prime members can snag it on Amazon right now for just $99.99 with free shipping. That’s a great deal on a top-rated DNA test, which earned our coveted Editors’ Choice award for its “thorough ancestry reports,” health tests, and more.

“23andMe offers a trove of information about both your personal genetics and your deeper ancestry,” we wrote in our review. “This top DNA testing service also offers looks for genetic health risks, as well as your carrier status for many conditions.”

Once you get the saliva collection kit in the mail, you’ll need to spit in the provided tube, register your sample, and mail it back to 23andMe’s lab using the pre-paid package. From there, your reports will be ready in around six to eight weeks.

On Amazon, the 23andMe Health + Ancestry kit has an average rating of 4.1 out of 5 stars with 2,293 customer reviews. One person said it helped her solve an “83-year-old mystery” of her grandfather’s identity. Another reviewer said it helped save their life after revealing they were at risk for blood clots.

This kit dropped to $169 on DNA day in April; if you passed on that deal, be glad you did because it’s way cheaper now. Don’t miss your chance to grab the 23andMe Health + Ancestry test kit for just $99.99, or 50 percent off.