You may buy direct from any of the following fine companies:

Vista Data Vision Distibutors

Campbell Scientific Inc, Utah, USA, www.campbellsci.com/
The world leader in dataloggers, sensors and accessories
Area:  USA and Worldwide
Contact:  Mike Thurgood

Geokon Inc, New Hampshire, USA, www.geokon.com/
The world leader in vibrating wire technology
Area:  USA and Worldwide
Contact:  Tony Simmonds

Campbell Scientific Ldt, www.campbellsci.co.uk/
The European subsidiary of Campbell Scientific, Inc. of Utah, USA and serve the whole of Europe through it's head office in the UK, through affiliated offices in France, Germany and Spain and via a network of distributors across Europe.
Area:   Europe
Contact:  Simon Dawe

Vista Data Vision Resellers and System Integrators that support VDV

GKM Consultants, Inc. Montreal, Canada, www.gkmconsultants.com/
GKM Consultants offers geotechnical instrumentation, data acquisition systems and monitoring services for civil engineering applications, notably for dam safety, tunnel, bridge and mining.
Area:  Worldwide
Contact:  Jean-Marie Bréhé, ing.

Bridge Diagnostics, Colorado, USA www.bridgetest.com/
BDI offer all types of structual testing service and equipment
Area:  USA
Contact:  Brett Commander, P.E.

Advanced Monitoring Methods, LLC, Colorado, USA - http://www.AdvM2.com
Advanced Monitoring Methods provides high-quality, high recovery monitoring services under all environmental conditions and locations.
Area:  USA
Contact:  Thomas W. Brauch

Foundry Engineering, LLC, Nevada, USA, http://www.foundry-engineering.com
Foundry is a leading provider of engineering, construction, and risk management services for public agencies and private sector companies around the world.  Foundry's project portfolio encompasses the infrastructure, mining, oil and gas, and transportation sectors.
Area:  USA
Contact: Cory Baldwin

Atmospheric Systems Corporation, CA, USA, http://www.minisodar.com
Atmospheric Systems design, manufacture and sell a surface based atmospheric remote sensing instruments and systems to monitor the atmospheric boundary layer parameters such as wind, turbulence and temperature profiles.
Area: USA
Contact: Josh Underwood

Intermountain Environmental, Utah, USA, www.inmtn.com/
Environmental equipment and services
Area:  USA
Contact:  Josh Hanks

Itas, Aas, Norway, www.it-as.no/
IT Consultant, instrumentation, service provider and datalogger networks
Area:  Norway
Contact:  Oddvar Haga

GEONOR, Inc., PA, USA, www.geonor.com/
Serving users in Geotechnical & Structural Engineering, and Meteorology.
Area: USA, Canada, Hispano America (Not Brazil)
Contact: Ed Brylawski, P.E.

A.P. Company d.o.o. Koste Tausanovica 2, 11000 Belgrade, Rep. of Serbia, www.apcompany.co.rs
Area:  Republic of Serbia, Montenegro, Croatia, Slovenia, Macedonia, Bosnia, Romania & Bulgaria
Contact:  Zvonimir Predic, Director

Koenders Instruments B.V., Almere, Nederland, www.koenders-instruments.com/
Instrumentation for hydrology, meteorology and geotechnical systems, datalogger networks
Area:  Nederlands
Contact:  Robert van der Veen