To continue ethel's answer (which is correct as far as it goes)
I suspect you possibly meant a wireless connection directly to the printer?
there are a surprising number of home printers with wireless capabilities (mainly lexmark) for not much money
the other option would be to get yourself a wireless print adapter
http://www.nextag.co.uk/adapter-printer-wirele ss/zzukzB1z0--search-html
(but most of them actually cost more than the lexmark)
some routers have a print server port built in ... and many printers have an ethernet port which will connect directly to the router's hub.
I'm sure I've also seen a printer which will take a standard wireless dongle ... but I just can't remember which it was.
any of the above have the advantage that you don't need the PC connected to the printer switched on all the time.