Color Printer Suggestion High Volume?

My business prints packets for customer orders daily. They are updated color sheets two sided approx 200-300 double sided pages per day. Previously we used Phaser 860 printers and now use the phaser 8550. We cant find any more 860s used and ours are completely broken. Even using generic ink blocks for the phaser we are using plenty of ink and maint drums. Is there any other solution to get the job done for less? Most of these pages have pretty good ink coverage. This material cannot be printed by a commercial printer as the daily inventories of images are actually adjusted daily. I appreciate any suggestions.

Rob