Board-O, which Jumilla wines do you have in mind? I'm sure I'm forgetting many, but just to start:
Marques de Riscal
Marques de Caceres
Marques de Murrieta
Muga Reserva (actually a bit over $20)
All those producers have solid offerings for less than $20. I would be interested to see your list of the many "better" wines from Jumilla.