If YouTube isn't blocked at your workplace you can always check out lots of Jake, Aldrine, Brittni Paiva, Taimane, John King, John Kavanagh, and plenty of members of this forum. You can also check out myspace pages, or look up uke artists on Songza.com
If your in the UK? you could use spotify, it's a streaming radio player that has lots of free music, Jake and Aldrine have albums on there. And it freeeeeeeeeeee!!!
Found a great site with Hawaiian music and it is free but they ask for donations to keep them going. It's only fair!!! The site is www.hawaiianrainbow.com
Enjoy, I do!!!