Ah, thanks! I am so used to seeing my grandmother's huge hydrangea bushes that that didn't even cross my mind when I saw this guy.

It is a Billbergia, probably B. x'Wendtii'.

Jeff: Liar, liar, pants on fire! When you KNOW I brought my own crew of ants to help carry the plants to my car... But don't I wish that I had been able to buy so much that I needed help! Instead, I was limited to what would fit into one of those shallow boxes. Maybe in June I'll bring my own bigger one and pile things on top of each other. In my frustration over not being able to buy more yesterday, I went out to Daniels' Nursery this morning and loaded up on Echeveria gibbiflora Mauna Loas and some other things as well. If DH hadn't been there with me as a restraining force, who knows how much I might have bought? Thanks for the ID comments.

It looks like a cultivar of Carex morrowii, judging from the leaf markings and offset babies. I've never grown it from seed, but I use dozens of the offsets per year to start new plants. I have hundreds of Carex specimens in my garden. With the exceptions of C. grayii and C. muskingumensis, I have never had a seed-grown volunteer, so I'll guess they don't germinate easily.