EOFY Sale at the Switchbot store, I found this while I was trying to work out a way to control a remote control roller shutter that uses rolling codes, so I can't use something like a Broadlink on it.
Possibly fairly narrow use case for most people, but 30% off is 30% off. I paid ~$107 AUD (+ shipping USD 9.99) for a four pack of the Bot Button Pushers, normal price locally appears to be from $50 up per unit.
I believe if you want to use it with something like Home Assistant (or Google Assistant, Alexa) you'll need the Hub Mini as well (which I also ordered).
Hmm never seen curtain rollers like that before. Pretty clever, I'm tempted.