This forum thread mentions the existence of an A64 3000+.
Please note that the benchmarks in that thread do NOT come from a 1.8GHz A64; they are benchmarks from a 3200+ running at a 9X multiplier. Currently, you can reduce the multiplier on an A64, but not increase it.
It references this Australian store (which unfortunately is just a sales page and nothing else).
Officially, the only 1.8GHz Athlon 64 that exists is a mobile CPU.
I used an Australian price engine, and checked those sites that came up for A64s, and found nothing besides the 3200+/FX.
In all likelihood, this is either a mobile processor, or the listing is the result of some error.
However, if you do happen to find other listings for A64 3000+s, please let me know.