Mothers makes a good bar. Around $17 for the clay bar and the lube (quick detailer). It will get the paint smooth, but won't do anything for scratches or luster. It's a good step though if your paint isn't as smooth as glass.

Clay Magic is also good. Walmart may even carry it in your area. I highly suggest a polymer-based sealer wax to a carnuba. properautocare.com has a few (Klasse is good, not the easiest to use, Blackfire is easy to use and good). If you want to go locally, Meguires sells one. I think it's #20. I forget. Klasse and Blackfire come with a polish I believe, the Meguires you would have to use one of their polishes after clay baring before you apply it. polymer's last a lot longer. Hope this helps.