I switched to Pyrocat-M (Metol) and only need 3 chemicals for Part A and had enough left over to make Obsidian Aqua and some D23. Most of my raw chemicals come from Artcraft, Bostick and Sullivan, and Photographers Formulary. My main print developer is now the PF-130 based on Ansco 130 and I find it easier to just buy the kits.
If you dilute your paper developers you can use them with film too in some cases but it takes some experimentation. Bleach, reducers, and toners are another area you will likely experiment with so its good to build up your inventory and equipment needed for mix-your-own solutions.