SULFUR Digital Archive
Sulfur, ed. Clayton Eshleman
Complete Run 1981-2000
Individual issue at: CEP
& one large (and searchable) PDF of full set at EPC Digital Library
Thanks to the Centre for Expanded Poetics, Concordia University: Nathan Brown (CEP Founding Director), Sina Queyras, Stephen Ross, Jonathan Sachs
The CEP archive also has complete runs of Eshleman’s Caterpillar and the classic modernist magazine Transition.

The link to the PDF isn't working. I'd very much like to download it!