We sell a number of commodes with and without buckets which might suit your needs.

You may find a mobile commode useful.  This has a chrome frame that can be used as a self contained commode or as an over toilet chair. The drop down, padded arms help with side transfer. The plastic commode pan is easy to remove and is covered with a detachable padded vinyl seat. Each leg has a castors with a brake and there is a detachable foot rest which swings away to aid patient transfer.