I found an amazing company which sale loads of different types of wheelbarrows. Its called Wheelbarrow Sales.
They have Garden Wheelbarrows with both plastic coloured pans, or galvanised pans, and with either a solid or pneumatic wheel.
I have seen them myself and they are of excellent quality.
If you need any more information, either post me a message, or visit their site. Its quite informative too which is a bonus.