Is Free Covid Testing Site legit?

I live on the NW side of town, and I wanted to get my family tested for COVID (wife and I are vaxxed, our kids are too young), we've got some symptoms, but nothing too bad. Anyway I found freecovidtestingsite.com and a location not too far from us that does both rapid and PCR testing for free. And just walk in. Sounds too good to be true, but just wondering if anybody has used them before. Thanks.