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Check out your state university labs. I use Virginia Tech soil lab. They do a great job and basic testing is free for commercial entities like our pine farm. They are pretty thorough. They ask the soil type ( you can get it from NRCS), when it was last limed, what the previous crops was and the yield (for N credits), and such. There is an extra charge for OM level testing, but they provide every other measurement and estimate I've seen on other lab results.
The results came back QUICK. I think they look accurate, judging by the change from the last time I did a sample and the inputs I'd broadcast between the two. The first sample I did through Grandpa Rays and I was happy with that service too. It was just simpler to do it through Amazon.com on a whim, and fast. A couple of results were strange compared to the first testing I had done. CEC was wildly different, from 21 to 11 for example. But since it's only my second test, I don't have a trend to look at. And, it might have just been the way I took the soil samples. I dunno.
I'm happy with it. I'm a deer hunter, not a food farmer. So, it suits my purpose well.
Whitetail institute testing kits are what I get. They are kind of expensive (15$) but you are only doing them once a year per plot so not a big deal to me. They get you accurate results back typically in days after they receive the material. They have always worked for me so it is what I will stick with unless my local coop starts doing testing.