Inland 4 port USB hub (non-powered) from Microcenter - $9.97. Shipping is $6.95 but if you have one locally (so you don't have to pay shipping) this seems like a decent deal.
D-Link 4 port USB hub (runs powered or not -- your choice) - $29.52 shipped with a $10 rebate.
Edit: If you live near a Microcenter and don't mind using a PCI slot, this 4 port PCI board for $19.99 might be a decent option as well.
D-Link 4 port USB hub (runs powered or not -- your choice) - $29.52 shipped with a $10 rebate.
Edit: If you live near a Microcenter and don't mind using a PCI slot, this 4 port PCI board for $19.99 might be a decent option as well.