Now available from The HPLHS Store, The Spirit of Revision – Deluxe Hardback Edition with the Zealia Bishop letters. The edition is illustrated and… “is extensively annotated by Sean Branney and Andrew Leman”. Which presumably means it may be worth getting this alongside the same(?) Lovecraft letters as found in the recent Woodburn Harris volume of letters from Hippocampus. Since I assume that the letters are there differently annotated by Joshi and Schultz.
Also, from the Dept. of Sumptious Dust-Accumulators, The Shunned House: Whipple Edition. Yours for just £350.