you can get them for between £25-50 but id question there quality.
If you need any parts i have a friend that own's a company importing parts from the Yankland give me a shout
Replace the cambelt but NOT the balancer belt save some needed cash
replace the water pump
replace seals that are leaking
crank pully...look at it if its wobbling alot check the torque on the bolt if thats perfect and its still wobbling id replace it
order should be:
Cambelt
Water pump
seals