if you want to replace the snycro's i have some bad news for ya. they come on the 1-2 hub the 3-4 hub and the 5th is a solo hub, each hub is right around 300 bucks. and thats just for the syncro's. and yes, each gear is right around 100 bucks each. when i figured my tranny problems out i thought i would go the route of rebuilding by just replacing the sycnro's and the bad gear and also the shift forks. well for the tranny rebuild i wanted it was well over 1100 bucks, i bought my type-r tranny for a little more than that and i have a brand new tranny with an lsd.
way i see it is if you know for sure thats all you need to fix and your tranny will be fine after that and can find someone to rebuild it for cheap then go for it. or just get what you can out of that one and order you a spoon equiped type-r tranny from jdmhondaparts.com and be done with it. it your choice, if you want to see it for yourself then go to the link i posted below and enter the info to select that tranny and look at the assembly and the costs of the parts then figure in labor. i know its not great news but hell im a straight shooter so just deal with it mang.
http://www.acuraautomotiveparts.net/acura/jsp/mws/catdisplay.jsp