Maybelline Color Show Polka Dots in Chalk Dust - £2.99
The Maybelline Color Show in Chalk Dust is a glitter packed with different sized dots in mostly blacks but some white ones. This polish can be worn over different polishes, and I really like the effect it gives. It's more of a 'grown up' glitter, and I really like how the monochrome dots look over bright coloured polishes.
This glitter really reminds me of the Loreal Paris Confetti topcoat, although Chalk Dust is a cheaper alternative, so if you are looking for a cheap dupe, I would say this is a pretty good fit. I do find that the Loreal Paris Confetti topcoat applies a bit better, as Chalk Dust is quite fiddly to get an even application of the dots, even so it's a much cheaper alternative for a bigger bottle.
Have you tried the Polka Dots collection by Maybelline, what do you think?