setup wireless router as access point only

I connect my Wii to the Internet but I have a wireless router and I want to buy one?

I want to know what type of device or a USB adapter can buy to create a wi fi access point for the Wii to connect. I do not want to buy or install a wireless system for any other device, but for the wii, since it is only used to download stuff. I have a cable in my home setup. Each room has an Ethernet port that connects to the Internet, so my imo would stupid to buy a wireless router and then have to buy more things to do all 4 of my wi fi computer capable so please no silly answers.

Scrooge

Internet Basics : How to Configure a Wireless Access Point

router

Install and Secure a Wireless Access Point (WAP) Part 1 of 2