source for inexpensive pellets

Take a look here:
Some of the Daisies are well under a penny per pellet.
I've bought pellets and airguns from DPCI wholesale before without issues. They'll ask that you place an order of at least $100, and state that you are a company, for they are a "wholesaler".
I have tried Daisy .22 cal (500 count) Hollow Point Pellets, but accuracy is not quite as good as CPHP, although not a huge difference. When shooting silhouettes, especially beyond 100 yards, the difference in accuracy is noticeable.

Daisy accuracy from my Streamlines @ 910 fps, has been quite wild.
Daisy shoot more accurately in my DRS than in AA S510 Extra, which are better than the Streamlines.

Daisy would be a better choice for me than FTT in the S510, but Apolo are better.

The jury is still out for which pellet is a better general choice for my guns than US CPHP, with Spanish CPHP as second.