Droplr is offering paid plans for USD 3 per month. For this you get 100GB of online storage.
You can also pick to pay for an entire year for USD 30.
The service offers an online locker for your files. There is no sync feature like Dropbox, SkyDrive or Google Drive. You can upload your data, you can share your data and you can download your data.
You can upload files of up to 1GB in size on pro accounts.
Larger Files & Increased Storage
Customized Drop Views