Good price compared to target ebay sale who have it for 15 ish. Usually around 18-20. The fake ones go for $9 on ebay so I think this is a great price for a genuine one.
cheers
Grey ones out of stock from this seller, but green and blue ones are $8 if interested:
https://www.amazon.com.au/LEGO-Classic-Baseplate-10700-Plays…
https://www.amazon.com.au/LEGO-Classic-Baseplate-10714-Plays…
is this really $10 for a square piece of plastic