forget about ebay, visit www.gumtree.com (which is now owned by eBay but is free for both sellers and buyers) and you will find a second hand child's slide in your area.
JoW has given you the right answer but i would just comment that their service is far from infallible. I was looking for something earlier this week and put in listings within 25 miles of my postcode, it came up with 10 results, 2 were over 100 miles away and one was over 150 miles away. Still, i suppose 7 out of 10 could be worse.
Search on 'child's second hand slide' and you'll get a list of results. Look on the left hand side and scroll down a bit and you'll see a heading 'Distance'. Enter your post code and set the distance you are prepared to travel from the options provided.
An online classified ads site may more closely model the newspaper ad format of local items. The massive U.S. classified ads site Craigslist.org also has sections for 26 different U.K. locations.
if you are in the UK try a web site called Bay Crazy which list products on sale on E Bay but are for sale within a more local area to your post code so collection in person is easier to arrange etc.
I have a blog called www.TheEbayEntrepreneur.com. You should check it out. It's filled with hundreds of ideas on what to sell and where to get them :)
Ebay UK how do you find items on Ebay in your area? I'm after a Childs second hand slide, but don't know how to find in my area
