I read somewhere that dragon corpses work pretty well, because they never disappear and you can store stuff there. Kinda weird though.
This is false. I've seen dragon skeletons disappear.
I would like a good alternative to purchasing a house at this point. Right now I am carrying about 100 lbs of stuff that I don't need on me, but I don't want to part with. However, I don't have the 5k to pay for a house in Whiterun.
You can purchase an amulet of mara and get married to the crazy lady in the whiterun inn (bannermane or whatever). She has a house you can use.
Can you use the house in the first town you get to (arrg, sorry I can't remember the name.. Riverdell or such) to store stuff in? I know it's not your house (and which house you can sue.. depends on the MQ).. and there are npc's living there (since it is their place).. but is anything you leave there safe? Or will the npc's loot your loot?
Actually this is a good question.