YOU TOO CAN DESIGN AND LAUNCH A UFO.
Your payload can be some thin balsa wood to which you can staple 6 foot X 1 inch strips of aluminum foil cut from your kitchen roll.
Nballoon 10 ft 120 inch 300g Giant Professional Weather Balloon For Meteorological Investigation Aerial Video Holiday Party Decoration Entertainment Toys Huge Balloons, Natural
For a couple hundred bucks, you could really screw with the government. Make them use a $400k sidewinder missile to shoot it down. Plus another $100k for the cost of the jet for an hour. LOL.