We have a semi-chain pharmacy run by a family of pharmacists in town. I was pleasantly surprised when they told me they have a program to rent durable medical equipment like crutches at $0.50 per day - a LOT cheaper than buying for short term use.
There are Orthodox Jewish “gemachs”, organizations which allow people in our community to use things like crutches and other durable medical equipment for free as long as they are needed, or for a certain time period. I also see stuff like crutches for sale at numerous thrift stores, for very little.