This is the same type cyanoacrylate glue that Dr's and veterinarians use for sutures. An equivalent to this glue is "Vetbond tissue adhesive".
They sell 0.1 oz of that for about $20.00. We have 1/2 oz bottles, (5 times as much, over 14 grams) for $11.95.
n-Butyl fingernail glue is different from standard types of fingernail glue, (ethyl cyanoacrylate). It's less brittle, and has no irritating odors. It's very thin, wicks very well, and when used correctly, it makes a great, durable fingernail glue. Our n-Butyl glue works great for applying our pre-formed nails, however for applying our Instant Nail Strips, we recommend using our regular fingernail glue. (Ethyl cyanoacrylate). 
It's important to wipe the top of the bottle thoroughly after use, as it has a tendency to stick the cap to the bottle if you don't. It's best to store this glue upright in a small glass or cup. And if you want to travel with it, you can put some into a pipette, and store it in a small plastic bag.
We also include 5 dispensing pipettes and fiberglass wrap with each order.