CHICAGO (CBS) — The White Sox are offering specially-priced tickets for their game against the Boston Red Sox Thursday, as Philip Humber returns for the mound after pitching a perfect game this past weekend.

The Sox say fans can buy tickets for $9 – representing the number of perfect innings – for all upper reserved seats at U.S. Cellular Field. Fans can also buy tickets for $27 – representing the number of batters retired – for lower box, lower reserved and bleacher tickets.

Everyone at the game Thursday night will also receive a commemorative Philip Humber perfect game poster, with photos of Humber during the game and after the final out, as well as the official team scorecard.

The White Sox are selling the specially-priced tickets now online, at the U.S. Cellular Field ticket office, and at all Ticketmaster locations.

Humber was named the American League Player of the Week on Monday, after pitching the 21st perfect game in Major League Baseball history on Saturday as the Sox beat the Seattle Mariners 4-0.

The game was Humber’s first complete game and shutout of his career. He needed just 98 pitches to go through the 27 Mariners’ batters and he didn’t allow a three-ball count until the ninth inning.

The perfect game was the third in White Sox history, tying the franchise with the Yankees for the most all-time.

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