I know that you asked for US, but I just saw a whole bunch of HP media at www.compusmart.com There were 700mb 16x, and 650mb High Speed CDRW [10x].
I just bought 4 50pc spindles of HP 700mb 16x from Compusmart. Disc Type, Material = CD-R, Cyanine ATIP Lead-in = 97m 24s 01f Norminal Capacity = 702.83MB (79m 59s 73f) Disc Manufacturer maybe = Taiyoyuden DX-dye SMART-BURN Speed Limit = 24X p.s. My burner is 'only' 24x so I don't know if it will burn faster.
My local Dollar Tree had HP 16X 74 min CD-R's - Made in Taiwan (proably Ritek or CMC - didnt buy any).