1
general::
Also, make a pile. Make a great deal of money, as in When the market went up they made a bundle, or He made a pile from that department store. The first term, dating from about 1900, comes from the somewhat earlier use of bundle for a roll of banknotes. The variant, alluding to a heap of money, was first recorded in 1864.
American Heritage Idioms
2
general::
Phrase(s): make a bundle [and] make a pile
to make a lot of money. • John really made a bundle on that deal. • I’d like to make a pile and retire.
McGrawhill's American Idioms And Phrasal Verbs