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Another choice is Schrader. It is actually the same as OEM since they made the ones that came with your car from GM. Rockauto.com has them for $50.79 (part # 28006 for the '97 to '00 cars) Currently on a wholesaler closeout with only 6 left.
I used the Schrader ones in my '99 although I bought the later ones ('01 to '04 and upgraded my receiver and key fobs too). The Schrader ones are the same as OEM except mine were red plastic instead of the OEM black plastic. They train just like the stock ones too.