Thanks! Most datasheets seem a bit vague when it comes to listed power output, probably because conditions can vary so much between devices and environments.
I wondered if people would be interested in purchasing them. The challenging part is that they become cheap only when ordering large quantities, and most fab houses consider a different silkscreen to be an entirely different job. I'd have to order, say, 500 blanks, and then print onto them myself. Maybe there's a market for that -- but it's open source, so it's not too hard to make your own :)
The total came to roughly $150 for the cards and another $100 for shipping + import fees -- so roughly $8 each. That's more than I hoped, but the ENIG finish, 0.8mm thickness, and higher-quality silkscreen added up.
If I were to purchase, say, 150, the marginal cost would go down greatly, and $8 is low enough that I'm still happy to give them to folks at career fairs.