I'm looking at going to a convention as a Shadowhunter from Cassandra Clare's Mortal Instruments/Infernal Devices series. I've basically got the costume, but what I really need are the props, and the essential prop is a 'seraph blade'.

They're basically clear, glassy tubes that turn into swords when 'activated'.I can't find any pictures that'll attach, but they do exist ;D I'm wondering if I could commision them for around March-April, and around what price that would be? If anyone could help, that'd be great!