Murata and other manufacturers do not sell units, they sell millions... The easiest way to get a 10.7 MHz ceramic filter is to find an old pocket FM radio (possibly thrown away) and extract the filter. It looks like a small flat ceramic capacitor but has three wire legs. Usually this is not damaged and can be used again.
In FM radios, the 10.7MHz filter is typically 200 kHz wide. There are also special narrow-band filters but difficult to get.