I just called Ilford's USA warehouse and here is what's in stock as of today. So if you need a size that is in stock we can have it drop shipped to you.

HP5+ 5x12, 6.5x8.5, 7x17, 8x20, 10x12,
FP4+ 5x12, 7x11, 7x17, 8x20, 12x20, 14x17, 16x20

Fred Newman