You can get toner cartridge refills pretty readily online, available from Amazon, some specialty sites and even ebay. Some local stores may also carry them - try calling around your area.
If one needs to buy a Dell 511OCN toner refill they can buy it from heaps of different online and retail shops. Such shops include amazon and on the dell website.
You can buy a bulk toner refill at the 123 refills website. You can also buy toner refills in bulk. They have different types of cartridges for different printer brands.
Yes, you can refill the lexmark black toner cartridge in your printer.
You can buy a refil kit for around 40 online that will refil many times
you will get maybe a bit more on a new toner so buying a new one is better then to hassle with the refill
One can buy Ricoh toner online at the websites of office stores, such as OfficeMax and Staples. Another option would be to buy the Ricoh toner on Amazon.
Remanufactured toner cartridges are toner cartridges that have been remade to your standards. You can buy them online on the websites of Amazon and Best Buy.
Some office supply stores such as Monarch Basics offer refills of toner cartridges. Otherwise, it may be easier to purchase new toner at places such as Best Buy or Amazon.
One can buy a copier toner cartridge at their local office supply shop, or online. When shopping online, one can use Google Shopping to find a copier toner cartridge at the best price.
I assume you are in the UK? Try Staples, Maplins, PCWorld or buy online.
It would be much cheaper to buy the toner cartridges new instead of refilling them because most places charge almost the normal price of the cartridges anyways to refill them and you can catch these on clearance for half price or less at alot of stores which would be more worth the money.