Hello Edward,
Lanpaks are all about convenience - the convenience of not having to ask people to exit the software to perform a function at another workstation.
Lanpaks cost between between $11-$17/month (the higher the lanpak count, the lower the monthly cost) when you amortize the acquisition cost over 3 years. You do not have to save an employee much time in a month in order to show a positive ROI.
Perhaps reviewing the modules that staff are opening to see whether they really need access to the module would be worth doing. People in Invoices can review a customer account without opening Receivables. They can look up Inventory information as well without requiring a lanpak.
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Andrew Bates