Is it possible to increase voltage from a power supply without incuring great current lose
The TPS55340 is a monolithic non-synchronous switching regulator with integrated 5-Amp, 40-Volt power switch. It can be configured in several standard switching-regulator topologies, including boost, SEPIC and isolated flyback. The device has a wide input voltage range to support applications with input voltage from multi-cell batteries or regulated 3.3-V, 5-V, 12-V, and 24-V power rails.
Features an Internal 5-A, 40-V Low-Side MOSFET Switch, 2.9-V to 32-V Input Voltage Range. Vout up to 38 Volts.

It is under 5 dollars in individual price, but you'd have to design a board, and get the small parts needed.

There are more that can do the same, but that has an internal switch. Boost regulators with external switches can carry more amperage and some could boost the voltage higher, with good efficiency >90%.

But the majority of the cost in Completed Modules, is you are paying for a working design, testing, and manufacture of them.