I should do a DIY on this. You could always do it yourself. Free time, effort, and knowledge is what your paying the mechanic for.

$75 sounds typical, but not a good deal. The filter costs about $25 and $50 labor (in hour increments) sounds typical.

This is a job you could learn how to do though (off the top of my head):
1) buy fuel filter replacement from Honda dealer (or wherever), which will come with a new crush washer in the box
2) do this in a well ventilated area
3) open your gas cap (the filler cap) to let the pressure out
4) pop hood and locate fuel filter (red arrows in pic below, it's the same for DX/LX/EX/Si even though engines are different)
5) look at the thing and note: banjo bolt on top, bolt on bottom to in/out fuel lines; filter is held in by a bracket which is bolted to a larger bracket which is held by 2 bolts to the chassis
6) get the right size wrench (17/18mm or something) and put it on the top banjo bolt but DON'T loosen yet
7) cover the filter and wrench with a rag and try to wrap the rage all around the filter; this is to prevent fuel, which WILL leak out, from spraying everywhere. Step 3 above should have reduced the pressure, but fuel will still leak out
8) loosen the banjo bolt and let the fuel soak in the rag... no there is no more pressure. (BTW, all the bolts follow the normal screw direction: clockwise to tighten, counterclock to loosen)
9) undo the bolt the rest of the way
10) for the bottom, you'll need two wrench to loosen the nut; and more fuel will leak out so keep the rag underneath
11) remove the 2 bolts holding the large bracket to the chassis
12) pull the filter and braket out of the car and remove the bolt holding the filter to the bracket
13) replace filter with the new one and replace the crush washer at the top
14) reverse the install
15) start car; it will take awhile to turn over as fuel has to be repumped into the filter. Let the car idle a bit and don't rev.