TULSA, Okla., March 21 — When Virginia G. Shores went to a pharmacy here to pick up five prescriptions, she thought she heard the pharmacist say she owed $250, but she was wrong. The cost, with her new Medicare prescription drug card, was just $50. "I was flabbergasted," said Mrs. Shores, whose kitchen counter looks like a medicine chest, full of pills for high blood pressure, heart failure, arthritis, nerve pain and lung disease. Mrs. Shores, 80, had been buying medicines from a mail-order pharmacy in Winnipeg, Manitoba, but now uses Medicare instead. "I was amazed at the amount of...