millions in or of or on

[neb090]

Federal and state governments have spent millions in tax dollars accordingly to prevent the carp from making their way into the Great Lakes, but an elaborate underwater electric fence constructed to keep them out has not worked as well as hoped, and policymakers are reviewing other options now.

In this sentence, could I use of or on?

Thanks.

Link: Invasion USA: Asian Carp Invaders Have Taken the Mississippi, Are the Great Lakes Next?

 

[Plettschner]

“Of” works. “On” does not.

 

[RM1(SS)]

I would prefer "of".