Google Drive is $9.99 for 100 GB.
On the thread's subject, I use rclone to access it - works great.
You need your own domain and set up GSuite Business account on it or a subdomain. Included in the offer: Google Drive - Unlimited cloud storage. The "or 1TB per user if fewer than 5 users" bit is not technically enforced. Even if it were, I think $60/month is still very competitive if you need to store dozens of terabytes.
Sticker price currently $12/month but there are also discounted offers available if you look for them
It’s about ~$49/yr in my country and even though I hate to deal with OneDrive compared to Dropbox, can’t beat the price as I anyway buy Office 365.