A few sources have confirmed that Radeon 2600 AGP cards should come in late September. We were surprised to learn that 2400 PRO AGP are already available, but the faster iteration will be shipping in very late Q3.
Nvidia still doesn’t plan to release the AGP version of its G8X cards and it looks like it has left this market completely to ATI. Radeon 2600 PRO with 256 MB memory in AGP flavour will certainly get a lot of attention as it should be the most advanced and the fastest DirectX 10 AGP card around.
It will be ready for the high season and if you want one just wait for a bit more than a month and you will be able to buy it.
More details are here.