Declaration
It depends on your custom regulation. Normally I prefer non trade item or sample valued '0' 0r symbolic valued like 10 or 15...
At some countries there are alot of regulation related with these kind of declaration. For instance in my counrty (Turkey) over 150 Usd or 100 Eur I have to pay huge amount of tax like a punishment. (Exm: I have just paid 3oo usd for 160 usd valued MR straps)
According to regulations:
I have to go and deal with custom consulting agency which acredited with Custom Office. Because only under 100 Eur valued items can be taken by personally from post office custom. Others You have to deal with agencies
But as I sad before it is related with your country custom regs.
What I do normally pleased from deals, declare it as a sample or low value good such as straps valued 10 usd (under 30-35 usd)
Other important thing is package!!!!!
What ever you buy, make package smal unnoticable, make it like ordinary 10 page love letter or brochure in bubbled envelope.
And of cource there should not be no sign, letter or any mark on the pack
But ?f the subject is xray machines or something high teck stuff DONT LIE May be just bend

as takashi sad...