Powering PC from 24V battery

My AC input to the computer converts to 19VDC, 7.9A, 150 Watts Max.
What are my options to power this from a 24V (2/12V series batteries). I have Googled and found some dc/dc converters @ 150W, but no prices! Volume discounts, like I only need one. Should I go for an inverter and use my current 120 VAC power supply? I'm a certified novice, but it seems silly to convert 12-24V DC to AC and then Back again to DC, or am I all wet? Some advice will certainly be appreciated.
Thanks; Don
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