High value bulk order.

So, is there payment protecting method that is preferred when ordering in bulk through a supplier?

I am about to purchase $6k USD of new products using a sourcing agent and was curious if there are any payment methods I should consider in the event that something goes wrong?

Let’s say I order 500 units of a certain product and I do not receive said product, would a business like PayPal protect me from such circumstances? I have no reason to believe this will happen through this agent, but still, for myself, $6k will always be a lot of money..