Picked it up for a total of $128 with the custom diffused downstem. It can look purple in sunlight, and blue in florecent. I love it.
I agree with the "thats a steal" comment made above. Your bong looks fucking divine with that light hitting it. Have fun smoking that thing man.
ADS (Amsterdam Design Studio) Tubes can be found in a lot of headshops. Around me they sell that exact tube for $120. When i bought mine, it didn't have that ashcatcher and it was only $85 with tax. I would say they are a mid line tube, but def. worth the cash. OP, Good luck with it.