The swap activity around American debt is still hardly mainstream.
Still, the idea of men using Botox, which is made by Allergan, is hardly mainstream.
Not to be confused with Armani, Marni is one of those labels that editors rave about: high fashion but hardly mainstream.
To most climatologists, the thinning of the sea ice is further proof of the warming of the earth's atmosphere, a potentially disruptive trend that hardly mainstream scientists now dispute.
But also bumping into brilliant, if hardly mainstream, British musician Nitin Sawhney performing (alongside the Qatar Philharmonic Orchestra) his live accompaniment to the silent Indian classic A Throw of Dice.
His subjects were hardly mainstream: Maelström (2000) dealt with an alcoholic depressive woman; Polytechnique (2009) focused on the 1989 "Montreal Massacre" when 25-year-old Marc Lépine went on to a campus armed with a rifle and shot 28 people, killing 14 women.
For a brand such as Margiela, which might be well known in fashion circles but is hardly mainstream, it is a fantastic opportunity to reach a wider audience, while for the H&M customer, these ranges have become both collectible and highly sellable, at inflated prices, on eBay.
That's hardly mainstream acceptance, but it at least demonstrates initial interest in what the company's attempting to do here.
Hardly "mainstream" Arizona, several members of the audience referred to the Mexican American Studies program as a tool of Marxist-Leninists; one woman declared it was part of a larger "Islamic" Catholic plot from Mexico to reconquer Arizona.
And yet, it's hardly a mainstream household food.
