Self sealing 4 and 9 inch balloons?
Do they make 4 and 9 inch foil self sealing balloons?
I've never seen 4 and 9 inch self sealing balloons for sale. The balloon professionals at BalloonHQ.com talk about using heat sealers for sealing those foil balloons.
If you plan to use many 4 and 9" foil balloons, it might make sense to buy such a device.
Ebay has quite a large selection of heat sealers.
Look for 4 inch or 8 inch impulse sealers. They seal both plastic bags and mylar balloons.