How to retrieve a single field from a table in laravel 5.2

$price = DB::table('price')
       ->where([ 
        ['days_id', $days AND 'deals_id', $selected_deal] ])
       ->pluck('price');

I'm using this code to get single price only but it give me all prices where these to conditions are coming

But when i insert $price in the table it give many prices 40,60,80,100,120,140

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