Answers that mention BigCommerce

For a nonprofit selling PDFs, training materials, and other digital downloads on a tight budget, I’d narrow it to two choices:

My recommendation

1. Payhip — best if you want the cheapest/easiest setup

payhip.com is probably where I’d start if you don’t already have a WordPress site or don't want to maintain software.

• $0/month on its Free Forever plan.
• Takes 5% per transaction, plus the normal Stripe/PayPal processing fee. Payhip Payhip
• Unlimited products and unlimited revenue even on the free plan.
• Handles file delivery automatically after purchase.
• Supports PDFs and multiple files, with files up to 5 GB. Payhip Payhip Help Center
• Supports pay-what-you-want pricing, which is particularly useful for nonprofits. For example, you can set a $10 minimum and let supporters pay $10, $15, $25, etc. Payhip Help Center
• Payhip says it offers charity discounts, so I'd contact them about your nonprofit status. Payhip

The big advantage is that you don't have to worry about hosting, download security, updates, backups, or configuring a payment system.

For a small nonprofit, I'd seriously consider this the default choice.

2. WooCommerce — best if you already use WordPress

woocommerce.com is my choice if you already have a WordPress website and are comfortable maintaining it.

WooCommerce itself is free and open source, with no monthly subscription and no revenue share. WooCommerce WooCommerce It natively supports downloadable products, including controls for how customers receive their files. WooCommerce

That means your basic stack could be:

WordPress → WooCommerce → Stripe/PayPal → PDF download

Your main costs would be hosting and payment-processing fees. WooCommerce currently estimates typical hosting at roughly $25–$350/month, although a very small nonprofit store can potentially operate below that depending on the host and setup. WooCommerce

The upside is ownership and flexibility: your website, customer data, products, and store aren't locked into a SaaS platform.

The downside is that you're responsible for WordPress/WooCommerce updates, backups, security, and troubleshooting.

What I'd choose for your situation

One other option: Easy Digital Downloads

If you're already on WordPress and almost everything you sell is digital, I'd also look at easydigitaldownloads.com. It's specifically designed around digital products rather than physical merchandise. Edd Sell Services Easy Digital Downloads

I'd rank it:

Payhip → easiest/lowest maintenance
WooCommerce → best open-source/value option
Easy Digital Downloads → best WordPress-centric digital-download specialist

For a tight-budget nonprofit, I wouldn't start with Shopify, BigCommerce, or a complicated self-hosted ecommerce stack unless you have a specific need they solve.

If you tell me roughly how many PDFs you sell, your monthly sales volume, whether you already have WordPress, and whether you need memberships/courses or just one-time downloads, I can recommend the cheapest setup—including the payment processor and approximate monthly cost.