Right now they are having a pre-season 20% off sale.
I have several perennials I got from them, that survive my summer drought on clay-
Cotula 'Tiffindell Gold'
Penstemon pinifolius 'Nearly Red'
Perovskia 'Blue Spires' (the species did not make it)
Solidago 'Fireworks' oh dear it is doing too well, anyone want some?
I lost Agastache 'Ava' and 'Rosita' before I realized Agastache is a no-no here, they were beautiful annuals.