There's also black 3.0 as others have mentioned. That one is a super pigmented acrylic paint, $30 for a 150mL bottle, made in Kentucky.

For Singularity, it's $125 for a sample size 20cm^2 coverage area. Made in Massachusetts and you pay for hazmat shipping. You have to heat it to 100C to activate, it's highly highly recommended to use in a well ventilated area with full PPE as the nature of aerosolized carbon nanotubes aren't fully known yet.