I forgot exactly which ones I bought, but there are tons of different options on Amazon and home improvement stores, in the USA at least. They all seem mostly the same, but just look different. I had a couple left over and made a little food & cat grass area indoors. :)

Example: https://www.amazon.com/Yaheetech-Decking-Flooring-Interlocking-Poolside/dp/B07KLVQQTP/