this is kinda jus a open question. trying to see how much you invested in getting certified not jus the price of the test but everything.
here is the run down for me
for the network+ it cost me nothing most everything i need to study and practice exams. so for me it was $150 on the test (word to the wise don't pay for any materials for the test its all on the web for free)
now for the ccna i have spent $35 on todd's book, $200 on routers [2500 models 4 total] , sims and videos $0. (i'm still lacking a switch but i may put out another $50 on it.)

my plans are to get ths next month

i have already started working on getting the stuff for the ccnp $160 for all the video training suite.. but i know i will need more stuff