Which preposition to use with chafferer

at Occurrences 1%

But chafferers at the corn-market, in spite of Cobbett, will talk about wheats and barleys, meaning different kinds or qualities; and a gardener, if he pleases, will tell of an oat, (as does Milton, in his Lycidas,) meaning a single seed or plant.

Which preposition to use with  chafferer