Just head on down to your local volunteer Fire/Rescue Company and let them know you would like to make a donation to their equipment fund.  If you live in an area with career personal, they may have a special fund for purchasing high dollar items like thermo-imagers or they may have a benevolent fund for the families of fallen or injured firefighters/EMS providers.  In some countries, the local Red Cross/Crescent/Star of David or Civil Defense may be the appropriate agency.  If you cannot donate funds, support their fund raising activities; you’re more than likely to have an evening of fun and/or a really great meal.  If money is tight and making a contribution is not possible, a personal thank you is always appreciated.  Also, please do not forget law enforcement, there are sometimes special funds to purchase ballistic vests for officers both human and canine.  Pete