Ice is available from a couple of different manufactures. Sunshine used to have some and may still. It's also available from CMA (Tichy), see part number 1012. There may be more but those are off the top of my head.

Jon Miller
AT&SF
For me time has stopped in 1941
Digitrax, Chief/Zephyr systems, JMRI user
NMRA Life member #2623
Member SFRH&MS