Menards now has the WAGO push connectors in stock. Also checked with
my electrical distributor and they are stocking them, another brand,
possibly Ideal. Looks like the answer to the pigtailing aggravation
using wire nuts on 12 gauge.
The distributor says the pros have had good results and they are
competitive with wire nuts in volume sales. Plan to use them soon and
report any difficulties, as we have all seen backstab problems before.

Joe