Depending on what gasket you made (transfer case adapter to transmission, or transfer case adapter to transfer case), both are available from drivetrain.com, just for future reference.

I needed the gasket ASAP, and since O'reilly's or Autozone did not stock it, I improvised. I know you can get it from Drivetrain.com, Quad4x4 and such for only $3-5, but you factor in that both places want 9.95 for shipping and it would be 3-4 business days, provided it did not fall on a Thurs. or Fri.
I can drive down to O'reilly's who are open 7 days a week till 9pm and make it for $3.99, plus I can get a burger on the way!