Exotic pets are not usually included in "food stamp" programs for pets like dogs and cats are, and aren't often needed. But, when an exotic pet owner needs help, there can be options available.
Start or join a local group to help owners that have temporarily fallen on hard times. Remember to be respectful, tactful and treat others how you would like to be treated. If someone eventually has to rehome their animal it is not as easy as taking it to the local humane society when all else fails. Working to help the owner keep their animal comes first, then helping to rehome if necessary.
Sources of food can be found with some creativity and work. Simply sharing to get someone through a rough spot may be all that is needed. With exotics needing a wide variety of foods, from meat to lettuce, a little brainstorming can be beneficial for all owners.
Local stores may offer at a discount food that has torn bags, boxes or ready to expire. Surplus garden vegetables are available certain times of the year and an ad on Craigslist can offer to clean meat out of freezers - which may be thrown away when someone purchases a new half a beef or similar, maybe a freezer quits working.
Mealworms can easily be raised in small plastic tubs and are useful for many birds and reptiles. Other insects are also available and knowledge learned and shared can help other owners, also.
During rough economic times it's better for an exotic community to work together than to be isolated or judged. Domestic pets, dogs and cats, have networks and options already in place. Exotic pet owners can easily do the same with just a little effort.