First, we can auction items with no seller fees. 100% of the final auction value goes to the foundation. This is called "direct selling."
Second, other eBay sellers can designate a percentage of their proceeds to benefit the foundation. Their fees are subsequently discounted by that same percentage. This is called "community selling."
Third, buyers can donate directly during the checkout process using PayPal.
Visit the foundation's eBay Giving Works page & make it one of your favorites!