The ban doesn't happen until 2024. I have seen a lot of sales on power equipment over the last month, but these are just 'year end' clearance sales (people out side the state have these sales also). So I won't come to Cal just to buy power equipment.
As for the chain saw, last year I needed to replace a deck, I got out my old gas chain saw and couldn't get it to run. I stop in a home depot and found a ryobi 18v chain saw. That worked out good for me cutting up 2x6 and other brush around the yard. I don't know how good this would be if I needed to cut a cord of fire wood. I have heard good things about the Milwauke saw (Milwaukee M18 FUEL 16 in. 18-Volt Lithium-Ion Battery Brushless Cordless Chainsaw Kit with 12.0 Ah Battery and M18 Rapid Charger 2727-21HD - The Home Depot