There really isn't a cheap way to make it accelerate faster. Every option that will add over 15hp is close to or above $1000. An air intake will make it sound cooler, and an EX intake manifold conversion will have better air flow, but these won't make a truly noticeable increase in power.
If you plan to stick with this car (or other Hondas) for a while, invest in other places, in parts that can be interchangeable.
A short throw shifter is an incredible upgrade for a small amount of money, ~$60
Manual Short Shifter, Precision Shifter, Acura, Honda - B&M Transmissions, Shifters, Torque Converters, Diff Covers, Coolers
Of course, a nice coilover set completely changes the car!! (if you don't already have aftermarket stuff). Tires, bushings(!), sway bars..... they may not make the car faster, but they make it so you don't have to slow down as much haha!