noun, の adjective
The kanji and the word are exactly the same. That means they share meanings as well.
Note that using 価 for あたい is uncommon in modern Japanese. It’s more commonly written in kana or with the 値 kanji.
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you to remember: Okay, this is a great value and price. Wait, what is? A tie (あたい). Get a tie, and it will make you more professional which will help you to get a better job. Great value, right there, just for a tie.
I can’t agree with this price. It's like a freebie.
No, no, no, this is a watch worth 5 million yen, okay?
The view from here in the spring when the cherry blossoms are in full bloom is truly priceless.