http://www.champlainvalleypaintball.bizhosting.com/
port handi
Paintball Action Games Paintball Field3124 Old County RoadNewark, Delaware 19702USA
check out www.brpaintball.com, they have a new one opening May 1st, 2009
area 51 paintball in Colorado
Gatsplat i believe, located in lewisville (dallas area) texas, off highway 121
New England
i also live in oregon, Oregon doesnt really have a big indoor field, assuming you want to play speedball like i do... if i want to play indoors, i go to "Xtremes" up in vancouver. its a awesome place to spend the weekend with your team or just to play as a walk on.
warzone paintball
Yes they have indoor fields.
I don't know about free, but if you're in western mass, where i used to live, in windsor there is a big indoor field facility that is about $10 to use for the day.
Yes, Obnoxious Paintball is now open for public use. It is located at 1305 Newbridge Rd, Bellmore New York 11710. This indoor facility features two-climate controlled fields. This facility may be used by teams,walk-ons, or private parties and events. www.obnoxiouspaintball.com 516-308-3358