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This ebay auction sells individual keys (not cheap).

http://www.ebay.com/itm/MacBook-Pro-13-Late-2013-A1502-Keyboard-for-key-caps-Replacement-AS-IS-/291726650318?hash=item43ec436bce:g:3mEAAOSwkZhWTm5n#viTabs_0

You may want to ask this seller if you can just rip off your existing key and simply put theirs in its place.

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