Avalon Acoustics Tesseract - 1.93 metres and only $300,000 !!
Sodastream Source | This elegantly-designed device lets you carbonate any drink, from tap water to soft drinks. The included plastic bottle has a metal base and top, is completely reusable, and will last a while — compare that to those disposable bottles you get from the local grocery. LED lights on the machine's face let you accurately gauge your level of carbonation. ( $130 )