EXCLUSIVE

Lindsay and her bro Cody hit up the famous Jack's surf shop in Huntington Beach Friday -- and according to the receipt, the actress spent a total of $2,723 on surfer swag for her brother ... and that was WITH a 30% famous-person discount.

But the $2,700 bill is just a drop in the bucket for Lindsay -- TMZ broke the story ... she's rolling in dough this year, raking in more than $2 MILLION.