One Waiting One Prisoner One Sacrifice - One adventure from Tim Shorts. 21 pages, $3.99
The Mad God's Jest - Free adventure from Shane Ward of 3 Toadstools. 19 pages. And did I mention it's free? Check it out.
Under-sized Adventures #1 - The Kobold Nest - Despite the name, it's just a map and vague descriptions. 50 cents.
Wormskin Issue 1 - This is more of a campaign setting than anything else. For B/X, it seems to be fairy inspired. Or maybe furry inspired, there's spells for cat people. $3, 41 pages.