Where you can find these films:

La Grande Bouffe - this can be found on archive.org to view or download, but it isn't subtitled there. So if you need English subs, I recommend downloading it and using the sub file found here

Meet the Feebles - also on archive.org to watch or download

Lost Highway - it's currently available to stream on the Criterion Channel, but if you can't access that someone uploaded it to youtube