[Plugin: Magic Fields] Sort Posts by Magic Field

Hi,

Can anyone help my adjust my code so that I can have my posts listed in descending order of a magic field called ‘price’?

This is my code: http://pastebin.com/YWXKVMhz

Basically, the code lists the child pages ordered by post title, pulling through the first image attachment of the child post as the thumbnail.

My SQL isn’t that strong, so I would appreciate any help!

Thank you.

http://wordpress.org/extend/plugins/magic-fields/