Two established blogs that I regularly read are for sale. SlyVisions and TheUniversityKid, have already published their posts about their sale.
TheUniversityKid is already listed at SitePoint with a current bid of US$3,500. The bin was set at US$15,000, which when met will not only win the buyer TheUniversityKid but also a Blogging Forum. Check the listing of TheUniversityKid at SitePoint for information about traffic, monthly income, readership etc.
SlyVisions on the other is not yet listed on any market place. The post about the sale did not include any official price for the blog and Sly (the owner) is only 85% sure of selling it. Well, if you’re really interested, get in contact with him.
Good luck to Sly And Jason! 
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{ 2 comments… read them below or add one }
It has now been officially been sold.
Hey Sly,
Congrats for a successful sale! And good luck to your new blog.
Cheers.