Connecting USB LAN to 10/100 LAN

I have a laptop and an Athlon PC connected via 10/100 crossover cable. This enables me to use the printers and do backups from my Laptop.
I also have two other machines with LAN cards built in to the M/B and accessed only on dedicated USB ports.
Does anyone know of a HUB that can accept both 10/100 and USB???, so I can add these machines to my LAN, (or another way of doing it).