Thanks - on the low end, they do have a $35/month 15GB plan which is prepaid, so I suppose I could get this for a month or two when I need it. It’s about 10x more data than I need though. I wonder if ATT has a secret “off menu” plan that is cheaper and smaller?
N.B. My currently active $15/1GB hotspot plan on Verizon is no longer advertised - it looks like their cheapest plan is $35 for 6GB.