Looking for cheap single switch or wall plug

Thumbs up for the TP-Link HS100. They are the cheapest off-the-shelf, locally controlled (no cloud) plug that works great with OH - I have many. They go on sale constantly, and you can usually grab a used one from Amazon Warehouse for $12 - $13. Sometimes you just feel like grabbing and going instead of the flashing and/or soldering routine. I even have a few of these already set up as “Roaming Plugs” on a sitemap just sitting in a drawer. I can just grab one and use it for something ad-hoc. One piece of advise, make sure you reserve an IP for each HS100 on your router.