I am happy to change to green packaging but I get my current packaging cheap and I don’t want to pay any more, can you help?

No, but consider how long you can keep filling holes up with polystyrene and plastic before you have to pay more for the pleasure and consider your customers perception about your product if it is packed in such a container and how it may affect your sales going forward. Not to mention the increases in price as these products are made in lesser quantities. But when you break it down we may be talking a fraction of a penny per piece and could that not add on to retail price especially as it may look more attractive and entice a more emotional purchase from a customer?