I search the compatible brother toner cartridge for TN420/450. I find 123inkcartridge which offer good price comparing with those genuine supply from Brother. Please share with me your experience if anyone who uses compatible cartridge from 123inkcartridge, especially TN420 or TN450. I also find another option which is to refill the existing toner cartridge. Anyone has used "InkOwl", it offers $11.95 for one bottle of toner enough for 2600 pages print. It sounds even a better deal if it works and the toner quality is reasonable. I would appreciate it if anyone can give me some advice for InkOwl as well. Thanks