DriveThruRPG is having a summer sale, "up to 25% off", and actually a good amount of stuff is 25% off. I'm planning to buy a few more Basic D&D items:

AC7 - Master Player Screen ($3.75)
BSOLO Ghost of Lion Castle ($3.75)
X7 The War Rafts of Kron ($3.75)
X8: Drums on Fire Mountain ($3.75)
X9 The Savage Coast ($3.75)
X10 Red Arrow, Black Shield ($3.75)

Addendum: Ended up also buying

X11 Saga of the Shadow Lord
X12 Skarda's Mirror