If you want the NB plate shoe you can get a better deal than that. Just search in the baseball forum for sites. The 350s are actually discontinued, though you may be able to get some at Honig's or Gerry Davis. New Balance has a new base shoe this year:
http://www.honigs.com/detail.asp?Cat=2&Sub=9&Item=1211
Also comes in wide and a mid-cut version.