If you're looking for stocks I guess it's Databull http://www.databull.com It has a 1 time fee and you can download free yahoo Quotes for the rest of your life... You can also take a look at DownloadQuotes (http://www.downloadquotes.com) Don't expect anything fancy.... You get what you pay for. I'm using a CSI subscription ($205 pre paid yearly for US stocls / Indices) and I can really tell this is the best of anything I have ever seen.(I'm using their World futures package as well) (http://www.csidata.com)
Stock Quotes Pro http://www.ashkon.com/sqplus.html - Twice cheaper than Databull - 1 time fee and you can download free Yahoo Quotes for the rest of your life... - + free fully functional demo