I was going to suggest maybe a camera tripod, which can handle the weight, but depending on the size of the refractor, this could cause problems, I see Andrews and Bintel sell a wide rand of Alt/Az mounts which would be suitable. Such as the SkyTee, from Skywatcher, handles 10kg all up and allows to mount two refractors only $299... or from Bintel, the Bintel Skyview mount for same price.. Have a look under Mounts on Bintels website
http://www.bintelshop.com.au Sure there would be something there that would be ideal.