HP was among the earliest vendors to launch PCs with touch screens through its TouchSmart line of all-in-one desktops. Today, the company is bringing the technology to its existing business laptop lines with the introduction of the The HP EliteBook 2540p and 2740p start at $1,099 and $1,599, respectively, and are expected to be available in the United States in April. The ProBook s-series starts at $719 and will be available this month.