I must confess that we have a Little Tikes slide inside our house. It does take up space but there is not a day that goes by that my kids do not go down it or turn it into a playhouse. The slide in my opinion is what we call a keeper.
Amazon has the Little Tikes First Slide on sale for $27.97(originally $34.99)Shipped! I hardly ever see these go on sale and they are very hard to find used because kids can enjoy them for a long time.