Some sellers are hesitant to send plants in the hottest weather of the year, Dave. It's risky. If they sit in a truck in the heat, they arrive as cooked mush. I'd advise you to wait a month.
Here's another nursery with Black Velvet and P. Gloriosum for $8
http://www.floridahillnursery....
http://www.floridahillnursery....
I got liner size Philo Gloriosum from a local nursery, Tropiflora, last year for $3.95 each. I checked though and they don't have any right now.