I'm just upgrading my network at home (from mere wireless broadband to wireless broadband plus VoIP telephony), so I have a perfectly good ADSL modem cum wireless router going begging. I'll sell it on Ebay if need be, but I thought I'd give my lovely readers — yes, you lot — first refusal.
So, it's a 3Com OfficeConnect ADSL Wireless 11g Firewall Router. For those of you who don't know, what one of them does is one end of it connects to your broadband ADSL service while the other end allows you to plug lots of different computers into said broadband service, either using ethernet cables or the magic of wireless. It's about two years old, in perfect working order, and has never given me any sort of problem. It comes with the original installation guide, power supply, and telephone cable, but not the box, and I'll chuck in an ethernet cable if you need one. It's quite easy to set up. It cost me about 80 quid new, and I'll sell it for £30 or the nearest sensible offer, plus postage.
"But," I hear you think, "what be the point of a wireless router when this 'ere computer has no wireless receiver?" Good point. That's why I will also sell you a D-Link DWL-122 Wireless 2.4GHz 802.11b USB Adapter. You plug it into your computer's USB port and it connects to a wireless network for you. I'll be honest with you here: it's absolutely fine on PCs but, in my experience, a tad dodgy on Macs. But it's had good reviews, so maybe that's just me. To you, £7. Or whatever.
If you don't already have wireless, this is a pretty cheap way of getting it set up. Drop me a line if you're interested.