The seizure follows the execution of warrants at addresses in Calderdale and Kirklees on Wednesday (June 14).
One man was arrested and later released pending further enquiries.
The officers were part of the Yorkshire and Humber Regional Organised Crime Unit.
Ramona Senior head of economic crime at The Yorkshire and Humber Regional Organised Crime Unit and said: “We take using the dark web to facilitate criminality seriously.
“Regardless of where or how criminal offences are committed, we will locate offenders and prosecute them.”
People can report information to West Yorkshire Police via 101 or use the live chat facility on the force’s website.
Alternatively the public can remain anonymous by contacting independent charity Crimestoppers via 0800 555111 or the website, crimestoppers-uk.org