Not strictly OSR in my book, but there are two works of Tunnels & Trolls fiction by Ken St. Andre, Rose of Stormgaard and Griffin Feathers.
No Place Like Gnome - There's something about gnomes that makes you want to make puns. This is a short (4 page) pay what you want adventure from the Frugal GM
Rogues in Rembello - Already mentioned, it's a free S&W adventure
The Lost Lands: Adventures in the Border Provinces - Not much detail given, 151 pages, $17, surprisingly cheap
The Northlands Series 4: Oath of the Predator - S&W adventure for levels 4-6. 22 pages, $7
The Northlands Series 5: The Hidden Huscarl - S&W adventure for levels 5-7. 16 pages, $7 (Ah, there's the usual Frog God pricing)
The Northlands Series 6: One Night in Valhalla - S&W adventure for levels 8-10, 18 pages, $7
Divinities and Cults (Sword & Wizardry Edition) - This had previous come out in LL and DCC flavors. 56 pages, $7.99
27 Dungeon Maps - Free for non-commercial use, I guess
Guidebook to the Duchy of Valnwall - Already mentioned, but this is a Labyrinth Lord sourcebook from Small Niche Game. PWYW.