Saddle Pad Material Question

[AcanthaRose]

Does anyone know where I can buy felt saddle pad material? I want to make my own saddle pad and use some of the same material to add padding to the straps on a saddle I just bought, but I have no idea where to find the right material that is not already made into a finished saddle pad. When I looked on Amazon, all I could find was felt for putting under carpets and furniture, which I don't think would be thick enough. 
Any ideas would be greatly appreciated!