Thoughts on this liner quote?

Would love input on this quote for a liner for a 15,000 gallon rectangular pool. We're in the NYC area, so prices are high. I couldn't even get anyone to quote since so many companies were building new pools last spring. Is this quote in the ballpark, or should I get more quotes? He did the measurements before we closed the pool but only provided the quote this week. THANK YOU!

I'm checking on the thickness but it may be only 20...

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