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I have played burntime dozens times since 90s. Recently I found a trick to buy from any merchant for free. Here is the trick:
1. Buy everything you want from a merchant using food, any food (meat, snake, rat, maggot)
2. Re-buy the food from merchant using this formula:
- meat can be re-bought using snake
- two meat -> meat and snake
- meat + rat -> meat
- meat + snake -> meat + rat
- snake -> 2 maggots
- 2 maggots -> rat
The principle here is to re-buy using lower total DR (daily ration).
3. In the end the merchant will only has 1 rat which can not be re-bought using lower food value. But if you also buy another item from the merchant which you do not need, you can re-buy that rat using that item. In the end you will get what you want without cost.