This is an entire epic fantasy, not a mere anthology!
Heart of the Staff, the Complete Series is $0.99 at Amazon and £0.99 at Amazon UK.
Heart of the Staff, the Complete Appendix is free at Smashwords.
Books one through six of the series are available individually at Amazon for:
Good Sister, Bad Sister $0.00
The Collector Witch $0.99
Stone Heart $ 0.00
The Burgeoning $ 0.99
The Reaper Witch $0.99
Carol Marrs Phipps and Tom Phipps