$64.99, $99.99, $189.99, and $349.99, respectively. Sleek Disk-On-Key Pro units (USB 1.1 for now) come in 16-, 32-, 64- and 128MB capacities for $34.99, $44.99, $69.99, and $114.99, respectively.
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Iomega is the only company besides M-Systems (Disk-On-Key) to have the Pro (new form factor). They call it the Mini USB, and the 64MB version (also USB 1.1) is priced at $69.95.