Spoilerdepot.com has one for the 4Runner that's almost like the factory one. So far all the aftermarket spoilers have LED brake lights that are mounted below the spoiler whereas the factory spoiler isn't LED and is on the face of the spoiler. Also check on eBay, I've seen quite a few that come painted for around $140.
If you don't mind drilling holes in your sheetmetal it should be a relatively easy install. I belive there are 5 holes to drill. One of the reasons I've put off getting the spoiler is because the thought of having holes drilled into my rear hatch scares me.