What are you calling reasonable David ?
I've just looked on a well known second hand book site and they have two.
If somebody is going to buy you a Christmas present how about 'The Genus Iris' by W.R. Dykes only £850
.
I saw a copy when I was down at Wisley once and a very nice book it was !!
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Andrew, did you mean on Amazon? If you did I found them this evening-expensive though, but not as expensive as Dykes. I've found Brian Mathew's The Crocus at £135 but those kind of prices are out of my league