I often make up to 6 lasangas at a time. They sell smaller disposable containers at migros which are perfect for 4 or 5 servings each. I also find that if you buy the club packs of ground meat at coop it is much cheaper as well. I also do vegtables ones.
A chef friend of mine once told me once to wrap the lasanga in tinfoil and then put it in a plastic bag and so far it works wonders......... I have left them in the freezer for up to 2 or 3 months.