Agreed that FCC unintentional emitter testing can be a pain, however, unless you're doing something very fancy it's not that hard to achieve, and it's not super expensive if you just need a low frequency unintentional testing.
I'm not a lawyer, but I think you can self declare as well for unintentional emitters, just if you get caught the penalties are much stricter than if you can prove you went through a lab.
[0] http://processors.wiki.ti.com/index.php/CC3000_Product_Certi...
Edit (after the first two replies below): I'm assuming a slow-clock device, say 20 MHz or less, as that's the limit of my PCB design skills anyway...
For something simple (clocks less than 200mhz), usually half a day of testing will cost between 1k and 2k I think. However, take these numbers with a grain of salt.
EDIT: they can also help you track down leaks and pass through testing the first time as well (i.e. say you're leaking tons of RF through a badly shielded ethernet port. They can track it down, and will have copper tape so you can test to see if a simple patch will fix it, which if the testing is much more expensive might be an acceptable step to add to your assembly procedure vs. doing a respin of the board).
And never assume a clean first-time pass.
If I was a government employee, I'd probably think it was right and proper to better protect Americans from stray radio interference from slipshod products than to reduce the one-time NRE charges to bring those products to market. It's not that I'm accusing them of shallow-mindedness, just that they have a perspective that the current process is working pretty well. (My perspective of trying to do a production run of 250 or 500 units of something is entirely different, but I can't make a compelling argument that "fixes" my problem without imagining that I might be introducing other, worse-on-balance problems.)
In theory, I should do testing for verification and or "declaration of conformity" for any run over 5 devices where I have a clock over 1.705 MHz for a battery-only device or over 9 kHz (yes, KILO-Hertz) for a digital device that plugs in, even to recharge batteries.
UL (or equivalent) testing/listing isn't required by law, but represents additional possible expenses if you want to sell to consumers.
It's already pretty daunting, tech-wise, to make the leap from "I have an idea" to "works on my bench on protoboard" to "works on my custom-designed PCB", but at least the out-of-pocket costs and risks are low there.
It's a much greater leap, cost-wise, to get the FCC paperwork in order, even for "unintentional radiators", to say nothing of trying to get a BTLE or wifi device certified.