There are two main navigation pages for downloads. This one links to descriptions of each item, including PayPal buttons and free download links.
The online store page has links to my most recent books. It has donation buttons. It has links for all the free downloads, including links back to the item descriptions. It has a PayPal button to buy all 26 "pay" items for only $50. That's a $50 savings, since it would cost $100 to buy everything individually.
Those items which are not free are sold in packets of one to six books costing $11.00 per packet.