Where can I buy this chess board?

Here is one place:

https://www.wholesalechess.com/walnut-and-maple-wooden-tournament-chessboard.html

or maybe it is this one:

https://www.wholesalechess.com/catalog/product/view/id/4939/s/maple-and-mahogany-wooden-tournament-chessboard/category/1211/

Almost any online chess site will have a similar board.

The second link looks closest but the outer edge looks lighter than the one in the picture.

There are cheap Polish boards made from mahogany and sycamore, in few different sizes:

with notation:

https://www.polishchess.com/chessboard-no-5-mahoganysycamore-light-with-notation-p-1088.html

without notation:

https://www.polishchess.com/size-no-6-light-without-notation-mahoganysycamore-p-451.html

Try image search for "chess board mahogany sycamore" and you'll find some more results, like:

https://thechessstore.com/sycamore-mahogany-classic-chess-board-2-125-squares/

Also "chess board mahogany and maple" brings more results:

https://www.houseofstaunton.com/catalog/product/view/id/4939/s/maple-and-mahogany-wooden-tournament-chessboard/category/1211/

https://www.houseofstaunton.com/catalog/product/view/id/4939/s/maple-and-mahogany-wooden-tournament-chessboard/category/1211/

https://www.chesshouse.com/collections/wooden-chess-boards/products/21-5-wooden-chess-board-with-coordinates-white-border

The house of staunton link you posted was the closest...but I believe that's board in the image below not the one from my original post. The original board I posted has a border color that's somewhere between its light and dark squares. I can't find it anywhere.