Products and/or Suppliers directories:

Lettopia is a free-to-use service (mostly for eBay sellers, DS friendly, USA warehouses ), as fees are being collected only from the suppliers. Additionally, by subscribing through DSComparison’s link, you will immediately gain $10, plus $5 within few days, as a welcoming bonus.
Wholesale2B has a ton of dropshipping products plus automation services, such as Sync Inventory, & Orders Fulfillment.
Salehoo (Suppliers Directory / Free Dropshipping guide) is one of the oldest and most popular of its kind.
Chinabrands is a global dropshipping and distributing platform, offering cross-border e-commerce supply chain system solutions.