We got our Thomas the Tank Engine one from Amazon when it was on offer. But I agree with the other person, Ikea are good. We would have prob got one from there if it was nearer!
I notice Mothercare do have some under £50 though, so they are not all pricey (but think there might be delivery on top?)-
https://www.mothercare.com/Motherca...sr_1_3&nodeId=212573031&sr=1-3&qid=1307359611
https://www.mothercare.com/Motherca...sr_1_2&nodeId=212573031&sr=1-2&qid=1307359637