Call of Duty 4: Modern Warfare

A complete copy sells for about $4 in PAL (EU, UK, Australia). Most of the ten sales in the last 90 days went for $3 to $6.

Look at the rating badge on the front of the box.

• An ESRB box, black and white with a letter in it, means a North American copy. Canadian copies have the same front with a bilingual back.
• A PEGI square with the age in it means a European copy. Australia, France, Italy and Nordic countries had boxes of their own for the same disc.
• A USK square (ab 6, 12, 16 or 18) means a German copy. Germany rates games itself instead of using PEGI.
• The Australian classification mark (G, PG, M, MA 15+ or R 18+) means an Australian copy, which is PAL like Europe's.
• A CERO letter (A, B, C, D or Z) means a Japanese copy.

The Standard, the Game of the Year and Maps, the Game of the Year Edition and two more. The price at the top of the page is for standard copies.

• Standard $31 sale
• Game of the Year and Maps no sales yet
• Game of the Year Edition no sales yet
• Platinum: The Best of PlayStation 3 $25–$902 sales
• Nor for Resale no sales yet

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Yes, also available on Xbox 360.