I refuse to assign exact numbers to what I've done on this site, if I do I'll likely leave and never come back....
DIY Startup Capital (tools, parts, etc...): $500
Headphones:HD600, SR225 (now gone, net 0), HF1, HD201, KSC35 (broken), KSC75, PtoS adapter: $500
Amps: Jesus help me... MINT x2, PIMETA, M3, PPA, Millett(s) not included (see next section):$750
Millett Hybrid Project: prototyping phase for the PCBs $300, 4 amps: $800
Projects to be completed, or "the parts bin": $400
All told, an easy $3,250 in less than a year and I don't even have a source...
So call it $3/post.
Nate