You can purchase Grendel’s Mother at the following sites.
Available from all good bookstores online and in town and to the trade through wholesalers Baker & Taylor and Ingram and the distributor NBN.
Paperback
978-1-78535-009-2 | $16.95 | £9.99 | 237PP
eBook
978-1-78535-010-8 | $7.99 | £4.99