How about a co-working space like WeWork? Or a quiet coffee shop?
Those co-working spaces are popping up everywhere. But they seem to start at like $100/day or $400/month. Kinda pricy.
...maybe? I think it's all a matter of perspective. If you were to select a home with its own home office in a MCOL (~$300/sqft) and finance it over 30 years the monthly portion of that home office would be about roughly $330/mo. Similarly in my area each additional bedroom pushes the price of a rental up roughly $400-500. Then you've got to heat/cool and furnish it, plus you are responsible for the cleaning, trash disposal, etc.
So $400/month for a dedicated space for co-working seems reasonable, especially since IME they come with internet, comfy furniture, a kitchen/snack area, bathrooms and none of it you need to clean. Best of all if your home life is prone to interruptions a co-working space gives you freedom from being dive-bombed by your kiddos during a zoom meeting or interruptions from Amazon requiring signatures.