IOGear offers the GUB211, a 2-port USB Printer Auto Sharing Switch, and the GUIP204, a 4-port USB NetShareStation.
The IOGear GUB211 is the only automatic printer switch compatible with Macs and PCs. It allows users to share a printer easily. No external power is needed. It works with Windows XP, Vista and Max OS X 10.3.9 or above.
The IOGear GUIP204, on the other hand, is a 4-port USB share hub that let users to share resources by enabling multiple users to access up to four USB devices, like external USB hard drive, scanner or printer. When the device is connected with a wireless router, users can access connected USB devices wirelessly.
IOGear GUB211 and GUIP204 is available for $39.95 and $99.95 respectively.