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Don't Have a COSTARS Login?
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To register your organization for COSTARS membership or to access your membership profile, you must first
acquire a secure user ID and password through the Keystone Login System. Select the link below to begin the process.
NOTE: After completing a new registration in the Keystone Login System, you must return to this page
(COSTARS Login) and enter your user ID and password to access the COSTARS System.
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New User Registration
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Are you a Supplier?
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This login page is for COSTARS members (purchasers). To learn more about COSTARS supplier registration or to login to the
PA Supplier Portal, select the link below.
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Supplier Information
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