I ordered my first diaper making materials from Very Baby almost 7 years ago. What memories this brings up! I think the quality is good and it's nice to be able to order many things from one place. You may want to find a free pattern online and practice making a few with old shirts or other inexpensive materials before spending a lot of money on the good stuff. But if you really want to do cloth diapers and sew your own the possibilities are endless! I first bought the Very Baby fitted pattern and their Snug Wrap pattern. I knew by then I didn't like velcro/ hook+loop closures so I also invested in a snap press. Back then there weren't a lot of options but now you can find snap applicators for pretty cheap. I sew some of my boys' clothes so the snap press has been used for clothes as well as diapers. I also bought Fold-Over-Elastic, or FOE, from Very Baby since I can't get it locally.
I'm not sure about the price of Very Baby's things but it has been many years since I shopped there. I know that there are many cloth diaper sewing supply sources available that weren't around when I was learning. I mostly bought from coops once I discovered them, as they tend to sell for a bit less. The trade off for coops, though, is that it can take a while for the stuff to get to you.