You are misunderstanding me. I'll write it up so a 5th grader can read it.
A person needs 750RMS @ 1 ohm.
an APSM-1300 is rated @ 1000rms, but actually produces 750rms as you state. So, thats 750rms CLAMPED POWER for $110 via
ebay
The next cheapest options i can think of for 750rms @ 1 ohm are mbquart ONYX and hifonics, both of which are decently priced.
A Hifonics HIFI1000 runs $150 shipped
A ONYX1000 is also $150 shipped
The APSM might not do rated, but the person needing the 750rms will be plenty satisfied, and he will save himself $40 - that essentially turns into a free box or a free wiring kit
Now, i know your smart *** is going to come back with "well why dont you buy an ramp that does a rated output of 750rms rather than 1000"
Feel free to find me an amp that does 750rms @ 1 ohm rated, that is cheaper than an APSM-1300 @ $110 shipped. Most marketed amps fall at 500 or 1000rms ratings, so an amplifier designed to produce power in between those marks will usually be mainsteam equipment, which will obviously come with a larger price tag.
Is your head out yet?