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It is! I got one for $750-ish about a month ago.

Do you have to be over 50 to take it?

Looks like no, but you're more likely to have to go the online provider route which is $950. https://www.galleri.com/patient/the-galleri-test

They're running discounts lately, my dr's office had $200 off for anyone that wanted it and they have regular sales every couple of months it seems.