Lossless JPEG - cannot find sample images, DICOM files

I am currently working on lossless JPEG files (not JPEG-LS). It is very difficult to find files to test my application.

Particulary I need files containing reset interval labels, multiple DC huffman tables, multiple scenes, or comment markers.

Do you know where I can find lossless JPEG files? Do you have anything you could share?

Thanks in advance, Witek.

EDIT: I could also use DICOM files using this compression standard (tag (0002,0010) Transmission syntax UID = 1.2.840.10008.1.2.4.70)