You can purchase a 2nd Bimini on the Internet at a reasonable price. Finding one that connects with your current top, matches the color and frame is tough. And then the cover needs to be cut and modified. I obtained a quote from a Bennington dealer a few years ago, and it exceeded $5k without the cover modification which surprised me.
On the other hand, you can obtain extensions that are only used when non-moving for less money, and they don’t require your cover to be modified.
One option:
Upgrade your shade with the SureShade bimini extension, available in classic black and stylish beige. This accessory seamlessly integrates with the SureShade power bimini, offering enhanced sun protection when docked or anchored.