Attunements are essentially energetic tethers that bring you into greater awareness of a spirit, help with communication, and more or less give you the phone number for that spirit's direct line. There are lots of people selling attunements on Etsy and elsewhere. Here's the secret...you don't need to be a reiki master or any other kind of "spiritual somebody" to create an attunement! We can all do it, and it's easy!
When you buy attunement after attunement online what's actually happening is a dependent relationship is forming between you and that seller. I prefer to encourage independence. If you're someone who likes their attunements then an investment here in your own practice will pay for itself in no time.
There are blank hexagonal areas where you put the sigils of the spirit you want to connect with and any spirits or servitors that help to make the connection. You can make these sigils up yourself if you want. They're easy to find on the internet...just print them out in an appropriate size.