What looks interesting?

I6 Ravenloft (1e) [$3, 40% off]
I10: Ravenloft II: The House on Gryphon Hill (1e) [$3, 40% off]

The only two TSR AD&D 1E modules are the excellent Ravenloft an Ravenloft II.

Beyond the Mountains of Madness (CoC) [$12, 40% off]

A pretty good campaign based on a classic novella. I ran it and just the base book is pretty meaty (I added other adventures and used the BtMoM companion).

Halls of the Blood King (OSE) [$4.5, 40% off]

An adventure for 3rd to 5th level for Old-School Essentials. Necrotic Gnome official products are a bit pricey so a good discount is appreciated. Even though I have no idea if this is a good adventure or not it's the only Necrotic Gnome OSE product on sale.

Hull Breach Vol. 1 (Mothership) [$24, 20% off]

Mothership relies on third party products because Tuesday Night Games makes few products. This is fairly expensive but it's a collection of 26 articles (12 of them adventures) in a 232-page book. These are written by a variety of authors, some already published.