Amazon has the TP-Link HS210 3-way smart switch kit. The kit comes with two 3-way switches. I bought this when B&H had a sale and it has been working great. You only need to replace one of the switches with a smart switch on a circuit. So you can install in two different circuits. You can also install these in a single circuit as well. I’ve done both. I was waiting for a sale on these.
I used Discover for 5% back on Amazon purchases as well.