Where to find parts - Online UK

[Boudicca]

Hi everyone,
Just wondering where everyone gets parts?

I'm looking for Throttle body gaskets and a new air filter.
and maybe more... as i'm going to do an error code check tonight.

It would also be good for future reference.
I have in the past bought from ebay (MR MR2)

Car has started to idle really strange - and often cuts out due to low tickover speed at lights...?
Car:
MR2 MK2 - Rev1 - 3S-GE

Thanks in advance.
Brian