We do not sell any of the various tools and doo-dads that might make diaper sewing easier. However, we're happy to provide you with this list of very reputable, well-reviewed resources to help you in making your own diapers. I have either used these sources personally, know their owners personally, or know others who have used the stores and been very happy. (We don't receive kickbacks or commission from any of the links below.)
Snap Presses and Snaps:
The Snap Store - sells presses and snaps.
Serena lives in China and ships presses and snaps from there.
JoAnn Stores - many locations, have Gutermann thread that goes on sale regularly.
CTS - good prices via mail order.
Free patterns are listed here.
Baby by You