There ar only 2 motherboards that I know of that still support AGP but PCI-E was designed as replacement for the earlier AGP slots so you never find AGP on a PCI-E motherboard. You would have to pick between one or the other.
Sure there is some, ASRock makes them. But the PCIe slot only runs with 4 lanes/X4 so if you had a upper end PCIe video card it would probably hinder it performance. But I would not really suggest one.