Trustworthy websites for radio code retrieval?

I know it's a frequent question, but I replaced my old stereo with another that I bought off Ebay, and the seller had no unlock code for it. I have read through the threads here and have seen many different websites linked to get this code but they were all from about 10 years ago, so I am wondering if anyone has had luck with any radio code website recently? Some of them seem like a scam so I want to make sure I will get my code if I have to pay for it.
Thanks!