in small quantities

See: piecemeal
References in classic literature ?
This was the best store we had come across yet; it had everything in it, in small quantities, from anvils and drygoods all the way down to fish and pinchbeck jewelry.
In the Doctor's little household, as in very many others, the articles of daily consumption that were wanted were purchased every evening, in small quantities and at various small shops.
So he had Lieutenant Albert Werper carried to his own tent, and there slaves administered wine and food in small quantities until at last the prisoner regained consciousness.
Fingal' and the rest, certainly contributed to the Romantic Movement; and they are not only unique productions, but, in small quantities, still interesting.