How do non AD's get their watches?

[coreyvet]

I own three Rolex watches. Stainless GMT I (1987 Hong Kong), stainless/gold submariner (2000 Bahamas) and gold Day-Date president (2006 USA). All were purchased from authorized dealers.

I would like to buy a stainless, white dial daytona but they only seem to be available via non authorized sources. I know the Rolex warranty is not valid from these sources but can the watch be fine otherwise?

I know I can have it checked at the Rolex service center but would it be confiscated if it is from a "questionable" ownership source. Do AD's sell their inventory to other watch sellers? I'm back to my original ? which is how do non AD's get their watches?????