I picked up my first magnetic polish in Sephora back when I visited NYC last fall. It was Nails Inc "House of Parliament." I think Nails Inc was probably one of the first companies to really kick this trend into the mainstream, but they're certainly not cheap. (They're currently retailing at Sephora for $16.) Thank goodness, then, that China Glaze released a more affordable line of magnetic polishes a little while later. Theirs retail for $6.99, plus you have to buy the magnet for an additional $6.99. With Nails Inc, the magnet is in the bottle cap, and it's meant to impart a wavy lines design. The China Glaze magnet has three designs: diagonal lines, chevron and star/asterisk.
As with so many things, though, magnetic polishes are a great example of getting what you pay for, but it's also a bit of a mixed bag. Let me show you what I mean.