Good IR LED for tracking with webcam at high speed from up to 50 feet
Radioshack are not likely to have a good range of things like this.  

For selection go to the big names like Farnell, Mouser, Digikey, RS, etc.
For example I opened Farnell, selected IR emitters (you can also type e.g. "IR LED" in the search box) and got these results, which I then sorted by viewing angle.
I picked the OP293A as an example out the list which is pretty cheap, has a higher current than a standard LED at 120mA, and a viewing angle of 120 degrees. There are options going up to 350mA and 200 degrees.  

Another solution would be to just use more than one of your current LEDs and angle them as necessary.