From what I understood after I left Logan 3 years ago...
There are no speedball fields. Nearest would be the trip to Salt Lake. There are a couple of woodsball "spots" up two of the canyons (if people still play there) - Zanavoo up Logan Canyon and the field at the mouth of Providence Canyon.
Shops? There was a paintball section in a local hobby store - I think (THINK) it has moved to another hobby store / storefront.
Sorry I can't be more help - left Logan (regretfully) in 2008.
Free Agent always looking to play within 150 miles of 64870.
Everyday Strangers rock my world.
Do you need a banana?