there are very few routers that will work with dialup.  the ones that do are expensive and won't work with all dialup providers.  if you have another computer (like a desktop), you can buy a wireless card for it and let it dial in.  it can then share the connection with your laptop over wireless.  note that this example uses two wireless cards and not a router and that both computers will need to be turned on.

another option is a product like this: http://nebowireless.com/tech.html

Message Edited by NemesisDB on 12-25-2005 08:39 PM

I wanted to add a few things ;p

I re-read and saw you asked about routers.  A low end router will run 10 to 30 dollars.  A low end wireless router will fit my other estimate.  A router (wireless or not) won't be that much use to you without broadband unless you have another need for networking multiple computers if your home.

If you're going for a wireless router, look for something that supports WPA2 encyption or AES encyption.  Even some low-ends will support this, and it's far superior in terms of security