Elegran
A lot of things are sold in packs (fresh or frozen) that are too big for one person to finish before they start to deteriorate. I divide them up into reasonable portions before freezing them, and either repack them in smaller containers or put bits of foil ot plastic between the pieces. That way, you can get out enough for immediate use without defrosting the rest. It can sometimes make for a lot of work when I get a big supermarket delivery, but it saves waste, and bigger packs save money. (Sorry if that is teaching anyone to suck eggs)
That's exactly what I do. It only dawned on me recently when trying to bash and separate a 4 pack salmon fillets, chicken bits, and even turkey mince. (the latter cheaper than chicken and very low cal)
My other option, which may save on cooking costs, with chicken pieces and fish, is to cook them all the night I get them, have one, and freeze the rest in small separate bags then a quick microwave before eating the rest.
I wash and re use the freezer bags and save bread and other plastic bag packaging for same.