Discount with multiple discount codes?

Hi,

I was wondering if nopCommerce offers (or if a plugin exists) that offers to create one discount rule that has multiple discount codes?

It would be very tedious to enter a few thousand discount one-by-one, so I wanted to see if anyone knows about a good way to do this before I consider creating my own plugin.

This has been discussed before.  But I don't think a plugin yet exists for it.