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LEGO Classic Gray Baseplate 10701 $ 9.99 FS
https://www.amazon.com/LEGO-Class…+basepl
Also at Walmart :
https://www.walmart.com/ip/LEGO-C…1/42104277
Side note :
Walmart B&M has the large grey baseplate for $ 8.00, and the small green baseplate for $ 4.00 – YMMV