Tidal does not post the cost to buy a song or an album on their site


Seeking to find out about streaming. I know Tidal charges $19.99 per month for listening to  high fidelity music on their site. But what if you want to purchase a song or an album? What is the cost?  There is no phone customer service phone number  that I could find to call and inquire. They do provide "Answers to frequently Asked Questions". I am surprised that nobody has asked the cost to purchase a song or an album. If I missed the information I have requested, would appreciate if somebody who used Tidal could provide assistance.  Thank you.  
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On Tidal, one doesn't actually buy songs. If you wish to download a song, or an album, for offline listening, you can. But once you are no longer a Tidal subscriber, those recordings are no longer available. As such, it's more akin to renting than buying.
-- Howard

Thank you for clarifying for me.
In essence, if I enjoy 10 songs or 10 albums, the only way I can continue
to listen to them is if I maintain the subscription for $19.99 per month.
If I don't I cannot listen to them anymore. Are there any hi resolution sites that actually allow you to purchase the music, ie listening at any time?
Thanks.