You can buy a replacement bearing and press it in yourself. A large bolt and a couple of sockets work just fine it you don't have a press. I haven't verified this for a 99, but I believe the bearing will be the typical 6203-2RS which is 17mm x 40mm x 12mm and rubber seals on both sides. At least that's that it is on my 89MJ, 93ZJ, and even the 2006 Nissan Frontier. I get mine from vxb.com for a couple of buck each. http://www.vxb.com/page/bearings/PROD/6203-2RS10
Just looked at a pulley I still have in the garage. The original was FAG brand from Canada.