Agarwood with "resin" painted upon the surface, wood dipped in perfume, wood that actually isn't even Agarwod has now crept into the market. The problem with this, apart from getting ripped off is the potential health impact. Real Agarwood possesses qualities revered by civilizations for thousands of year, respiratory, mental and other physical ailments have all been allayed by Oud. If you were to burn wood dipped in fragrance the first question you have to ask yourself is was the fragrance designed to be burned? if not all manner of toxic chemicals could be released.
The advice is simple, do your homework and when you do find a supplier ask lots of questions. Information is king and will enable you to make the right decision. And finally, if its too good to be true then probably best leave it. Agarwood is a pricey commodity and something cheap on eBay may possibly be an amazing find but probably not!