I called grace to find out who their dealers are but no one answered. (I work 10 blocks from thier office. Boo yea!!!) I left a message so I'll let you know when they get back with me.
Wind over the earth here in Boulder has them for $569 plus shipping. You can visit thier website at www.windovertheearth.com. They are Grace's largers dealer. The folks at both of those places are really really helpfull, so if you have questions, call them or I can relay any questions for you.
