Thank you for all the information, @borodaus!
I haven't spotted lemon branches or trees for sale.
I'll seed my own herbs next time. :)
Meanwhile, daughter is in mourning over the little cypress tree I bought her before Christmas. It looks green but it's dry and brittle. I've been pruning it today and can find no live stems on it. Poor little tree. I'd hoped to plant it outdoors and see it reach 15 feet... maybe next year!