Welcome to the DIY team. Some dealer parts will be higher than most. Here is a link to ECS Tuning. A great place to buy parts cheaper. Also Germanautoparts.com is another parts house that I use.
Volkswagen New Beetle 2.0 > Engine > Ignition
Didn't know about the battery thing. Just start over on installing it. Remove neg terminal then pos. Wait ten minutes then connect pos. then neg. terminal. Should clear the airbag light.
Franco