More power supplies, wall warts and transformers than you can shake a stick at. Several from printers; others may include phone chargers but most have co-axial connectors.
I'm not going to list them all: if you can tell me the rating you need or want to come and browse, I'll do my best to help. Ideal for obsessive tinkerers like me but I need the space.
Transformers & mains adaptors (Cholsey/Wallingford OX10)
This offer has been gifted to someone and is no longer available.