No, they are not available in-stores. To find the proper key blank for your mailbox, please reference the infographic below. Once you receive your key blanks, they must be taken with your original key to your local locksmith to be cut (automated machines cannot cut specialty dual sided key blanks).
5143 Key Blanks for 6200 Oasis Classic and 620020 Oasis Tribolt Series, the 5141 Key Blank and the 5140 Key Blank are available to order through our Authorized Reseller, EasyKeys.com, which can be found HERE.
Or you may call your local locksmith to determine if they have your specific Architectural Mailboxes key blank in stock.