I've made some improvements to my garage

SouthArk370Z

If you're talking about the "shiny bubblewrap", I haven't seen any of it in this area.

Before this is over, I'll probably have to order something.

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If you are going to order stuff go to a real lumber yard/building center not Home depot/lowes/menards. You can get panels and batts of any width and most any r value.

I would go with r-38 faced batts then blow 4-6" of cellulose to cover all the gaps. Might be a bit overkill in the south but it will be well sealed to keep the A/C in. Don't forget the rafter vents before you insulate or hang the lid for proper venting