Have a read up on dye sublimation based printers is the first suggestion off the top of my head if you need occasional printing at photo quality.
The other obvious one is colour wax based printers but they're in a different price league and pretty old fashioned. Phaser was the brand I remember from pre press work I used to do.
Middle course though: Would a colour laser not be suitable or do you need photo quality?
Finally I'm seeing colour inkjets at 18 quid in the warehouses - they're effectively disposable if it's for business.