My neighbor's mother gave her some dahlia tubers. She shared some with me — some samples from the Glow series which are purported to be "ultra compact and often more floriferous".
I took 'Cheeky Glow' and 'Delighting Glow." She took 'Polar Glow', 'Secret Glow', and 'Frivolous Glow', and we planted them immediately. Hopefully it's not too late and we'll see some glowing blooms this fall. I also got some begonia tubers, but haven't found a place for them. I'll probably stuff them into a mixed container.