I was looking for an '86 Chevette heater core and found one at Checkers Auto. When I went to pay for it the total was about $45. I live in Hawaii so I assumed it was shipping and crap. Later, I went to the Autozone website and saw a heater core for $16 ($6.45 for USPS shipping, $20 for 2-3 day shipping). Did i just get jipped?