You can probably find it in any video rental place. I've seen it at all the local ones near me so i'd say it's a seguro bet you can find it. Or you could take the leap and buy it used on DVD here. link
But i should warn you that from what i hear it isn't too good so you may want to just try renting it before you buy. :)
amazon.com is a great place to find stephen king movies. i even found the version of the shining where stephen king directed it on there at a super great price it only cost me $3