Research Sourcing Promotional Products Online

I need someone to do some research for me in sourcing some products.

I have a UK client (London) who runs a charity to help children and families in need and they want to raise awareness for this charity as well as raise money. They would like some promotional material printed with their charity logo and information.

They will give these out free at various events including charity walks.

Items we need to look at are things like mugs, pens, sticky bugs, car stickers, small stickers (the small ones to stick on a coat/top etc) and other items that might be good to go into a goodie bag.

I would like:

Names of online companies where I can purchase the above items from
Prices for varying quantities of the above items, including the physical goody bags themselves (without contents), together with the name of the suppliers
Ideas on additional items that you think might be of interest and where I can purchase them.
Ideas on what promotional items would be suitable to put in a goody bag for this type of charity with quantities, prices and suppliers

I would like all information supplied to me in a well-organised way so that I can determine the best options.