Premiums refer to Gamepass items. Due to the update which changed the game title to "MOW MY LAWN 2", there are currently no gamepasses being sold (these items are unobtainable unless the gamepasses are available and the gamepass items can be obtained again which is probably unlikely).
Infernal Mower[]
Cost: R$150
Gives you the Infernal Mower.
"Infinite" item pack[]
Cost: R$700
Gives Infinite Mower, Infinite Scissors, and Infinite Chainsaw.
Guard Duty[]
Cost: R$901
Gives you the guard chainsaw, and the Apollo.
No longer purchasable.
Mega Super God Pack[]
Cost: R$5000
Gives you the Kronos, Reaver, Reaver 2000, SIN, and the Ash.
BEST ITEM IN THE GAME[]
Cost: R$999999997
Gives you the Hyperion.