This sounds interesting, but I'd start slowly when using them for the first time or so.  I also think I would still use black pepper, as usual, in the recipes.

https://www.thespruceeats.com/what-is-grains-of-paradise-4780790

I'm going to look for them locally (at our health food stores) because online shipping costs have almost become prohibitive these days, especially when you're ordering 4 oz of something!  I did not check the shipping prices at any of the sites I posted below, because in order to find out what the shipping charges are you have to go through almost the entire ordering process.  Last time I was going to order from Mtn. Rose Herbs I deleted my order because of their shipping rates, although they do sell mostly organic stuff. 

I found the "berries" here:

https://www.mountainroseherbs.com/products/grains-of-paradise/profile

And here:

https://www.starwest-botanicals.com/category/grains-of-paradise/

And here:

https://www.frontiercoop.com/frontier-grains-of-paradise-grinder-2-26-oz/