Where can I get a copy of my 1095b form?

You should receive Form 1095-B from your employer.  However, it is informational only and the form is not needed to file your tax return. You just select the option that you had health insurance all year for 2016 and that is it.  You can just keep the Form 1095-B  for your records.

For additional information:

https://turbotax.intuit.com/tax-tools/tax-tips/Health-Care/What-is-Form-1095-B--Health-Coverage/INF2...

You will need your 1095-B form to file tax return 2017