Vinyl sheds usually cost the least at $100-750. Following this are metal sheds that start around $350, and are better quality than vinyl.

Wooden storage sheds start at $500 & above, but they last much longer that both vinyl & metal.

You ought to consider seeking the assistance of a home remodeler, as you may be better off investing such a money in making a room addition to your house.

Call some local home remodelers around for a free estimate. In fact, here is a handyman site that's been referred to me, which has a section devoted to home improvement articles, where you'll also find towards the far left, very bottom of the following home improvement page a big, bright, kind-of-orange ad that conveniently offers up to four (4) Free estimates that can be given to you very fast from local remodeling contractors in your area to help you build the additional room you want (or, if you must, a shed) (again, this free-estimate offer is towards the very left-bottom of the following linked page):

http://yourhand…

Like I said, get a hold of some local remodelers. In exchange for giving them work, you also might be able to get a good deal on the material from the remodeling contractor, since, usually, they have access to wholesale pricing on building material given the great amount of installations they do. That's the way to go. Good luck with your project!

Also, incidentally, here's some additional storage information you might want to consider:
http://yourhand…