In the e-Mail: @hplhs’s The Rats in the Walls.

The CD for The Rats in the Walls (including props) will be coming by regular mail, but the HPL Historical Society sends over the MP3 version when the physical copy ships.  And if you’re a fan of radio plays of this sort; the physical copy is worth the extra price, largely because it does come with props that are absolutely designed to be used in tabletop games. The HPLHS is very gamer-friendly, and it shows.