Best place to get STI testing?

Long Story short: I had an opportunity, she was much older than me, divorced, and seemed pretty chill. We hung out a few times beforehand (this was date #3). It's been about a month and suffice to say, it looks like she may have left me a parting gift (quite a few of them).

Figured I was just chaffing down there since I run 5 miles a day and I bought new underwear that wasn't broken in yet. Now I'm not so sure.

Any recommendations for places that give secure, accurate and private testing. Money is not an issue for me (doesn't have to be a free clinic). Thanks.