How much does neon cost?

I don’t know the costs, but you can buy neon. Call local sign companies, if they don’t do neon they will know who does in your area.

There may be local ordinances about who can buy and use it, but your sign companies will know better what they are than me.

As an alternative, helium is usually cheaper and you can make it glow almost as well as neon.

From $8 to $42 bucks.

I found this through some googling. This place sells 1liter canisters of gas for $2.50—$3.50

I also found this really sweet looking neon gas sample on ebay