I perfected my home recipe for lasagna when I had steady access to really good cheese in Europe.
We GIs split wheels/rounds amongst our households to make it more affordable, and any time anyone traveled to various European countries, the informal orders were placed to bring something special back to share!
Kind of slightly black marketish, but it was not entirely technically illegal over there due, to the special diplomatic-ish immunity supply chain...
Try to get your hands on real USA Commodity cheese.
The taste and texture will spoil your tastebuds for real “American cheese”, but it was/is impossible to legally purchase at any grocery store.
There used to be a lively black market in commodity cheese, and it is the quintessential American Cheese, imho. I haven't seen any around in over a decade.