To be honest, I have never broken a disposable lighter in 25 years of using them on a daily basis, so am not convinced they break easily lol.
I will try to describe how I keep mine dry, but am not sure it will be easy to follow without pics (I may be able to take some tomorrow if anyone wants.
I take an ordinary disposable lighter and then wrap masking tape all around the top of the case (just under the silver bit). I wrap the masking tape with the sticky side outwards.
On top of the masking tape I then wrap self amalgamating tape all round and upwards until it is level with the top of the silver part of the lighter (like a rectangular tube). After this, I form a lid over the tube with more self amalgamating tape to complete the water proof cover. Once the tape has amalgamated and is thus 100% waterproof, I slide it off upwards, and remove the masking tape stuck to its inside.
Thus, I have a very tight fitting cover that is totally rain proof, and virtually waterproof, yet will pop off easily and not break or lose stickiness.
On some of the amalgamating tape covers I incorporate a loop of some thin cord (usually reflective) so the lighter can be tied to something or hung around the neck. I suppose in a desperate situation you could always burn the rubber tape to get a fire going too.
I prefer disposable lighters to most other types, as you can just leave then in your pack and they will be ready whenever you want them. I do have some that are over ten years old and still perfect, which is certainly something you could not do with a zippo.
Edited to add: Mainland Europe has always been the place to buy unlubricated condoms, while ones for sale in the UK have always been mostly lubed.