According to my McMaster-Carr catalog, the GE B2A is the same as a NE51H. About $10 for a box of 10. www.mcmaster.com. No minimum order. Ships overnight most of the time. Same thing in my Mouser catalog. www.mouser.com. No minimum order. stock number 606-B2A, 99 cents each. 800-346-6873 Gerald J.