I guess people don't actually READ the full post before they reply. Since you already HAVE a SIM, keep using it as much as you can. But as Minnflyer and Montage said, go with a cheap electric park flyer or a SPAD and you can crash 'em and rebuild 'em and not be out much money at all. Just make sure you are in an area with no obstructions, people, livestock, or anything else that could be injured or damaged if you were to crash into it.