I ordered a 9.5mm IR cut (not IR pass!) filter from an ebay seller. It was $7, shipped, for a pair. Direct from China, of course.
Step 1: Testing the filter
I also made sure that it didn't matter which side up the filter was pointing. One side of the filter had a shiny coating. Both seemed equally good at blocking the TV remote's infrared LED. But just to be safe, I was going to use the shiny side on the laser pointer side (because one normally puts the shiny side of a filter on the side of the source).