Instantiating without the use of Resource Folder in Unity?

I am making a game which has around 25 prefabs. I want to generate these prefabs randomly one after another and also I am destroying the last prefab. One way is to make an array of gameobjects and then reference the prefabs to them. But this way a lot of memory is being used(around 190 MB) because of which my game crashes in android device. Another alternative is using the resources folder but I want to make asset bundle and I will not be able to make assetbundle of my resource folder. So is there any other way to Instantiate prefabs so that memory usage is also less and asset bundling is also possible.