Unfortunately, the fact motherboard manufacturers are even negotiating bundling deals suggests the Athlon 64 will indeed be in short supply immediately after its launch. It doesn't look like the processor will be cheap, either. The DigiTimes article quotes the "entry-level" Athlon 64 3200+ at $416, with the "high-end version" selling for upwards of $600.
The high-end Athlon 64 3200+ should line up well against the $615 Pentium 4 3.2GHz, at least until Prescott's release drives down Pentium 4 prices. For those of us with a little less to spend, a $416 "entry-level" Athlon 64 manages to be just a little cheaper than the current Athlon XP 3200+, and more intriguingly, the Opteron 144.