Where are the best places to get trainers for toddlers?

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This will be my 2.4 year old DS's first pair. Can anyone recommend any good (but not too expensive) sports shops that would measure his feet and get him a properly fitted pair?
I still think he's too young for cheapie shoes.

I had this same dilemma yesterday. Went to Clarks and to a shop that stocks Startrite and they didn't have ds's size (he is a 7). They were £25 and £30 which I thought was a bit much for trainers.

Ds only needs his for P.E. at preschool so I ordered some from Next. How about JJB sports?

Thanks willtry.
Will try somewhere like JJB but often you get young, vacant-looking kids working in these places who don't seem to have a clue!
I agree, £25 and £30 is a bit much. I'm just not sure if trainers need to be properly fitted or I can get away with a cheaper pair!