Jockey wheels??

Ive just noticed my top Jockey wheel is cracked on my xt mech,
Had a quick look online thinking that they would be a cheap part to replace how wrong i was.
Are they not all universal for the shimano range? (deore/xt/xtr)
I see they were listed for different mechs and top and bottom were listed too?
My mech is a 10 speed one and there isnt a hope in hell im paying 40 quid for a pair of them.

Anyone recommend a good alternative?

BBB do a cheap set which should fit around a tenner at your local bike shop

i have them in expert cycles rathfarnham 20 euro a pair (shimano)

Cheers id pop into u but I'm rarely in Dublin. The bbb ones I'll be able to get here,

Thanks for the replies.