We have been adding to the playhouse/swingset slowly, bit by bit since my sister gave us the bones for it.
We found a slide for it this weekend at a scrap yard for 30 bucks. So far the total spent for the whole thing is about $50.
I think the boys appreciate it more getting pieces added to it bit by bit rather than having it complete from the very beginning. This way it feels like a new toy all over again.
Now I think all it needs is climbing handles for the rock wall and a good painting.