They Cant do any lanterns? There must be something to hang off from the celing or walls.. maybe some sort of string from wall to wall they can hang off of? Paper lanterns are fairly light and dont need anything too concrete really. I would ask for photos of the room and then improvise as best you can... There must be a way to make that room pop! You could also look into an outside vendor for the helium. You may have to pay a vendor fee, but if you are really set and have all the supplies it may be worth it. Also I know wal mart in Canada sells helium tanks (mini) perhaps there is a place there that may sell something like that. I know Cuba doesnt have wal mart, but maybe you can google some places? Hope that helps!