Need help finding a simple router to do the following

We are going to be at a trade show where I will need to set up a WAP.  The trade show will give up a public IP address and like 10 additional addresses for Internet access.

I need to put about 80 devices on the wireless so the 10 they are giving won't be enough.  So, I need to setup a private network using a router and then add the WAP to my private network and hand out DHCP.

What I'm looking for is a low end simple router with a simple setup/wizard that I can use for this.  I won't be attending the show and it will be someone w/out a lot of networking experience so I need to have them easily be able to change the addresses w/out any problems.  

I will also say that using an actual wireless router is out of the question as we will be using a Ruckus WAP we already have.

Could someone please recommend a router that might do this w/out to much cost or learning?     Thanks....