no, but used to use ijt.biz when was in the UK, couldn't fault them.
on a straight web comparison, next day is cheap, with cheaper postage and a much nicer website with search facility. but ijt is cheaper for 5 or more units. plus they offered an indemnity guarantee so if using a fake toner / cartridge damaged your printer they would cover repair / replacement costs.
depends on the service you get when you have an account and what extra 'educational' discount you can wangle, plus any extra haggling and free gifts. (damn, i loved it when i was involved in purchasing.)