strawberries?

please.  Does anyone know where I can purchase (or get for free, I am a Yorkshireman) any perpetually flowering strawberry plants?   I have asked at local garden centres, but they just look at me like I am a stupid old  fool,  Mmmm (wait til they can't find where they've parked their  car )   Apparently these plant are better for allotment growing?     I have also looked in catalogues (no, not those, gardening ones) 

RHS recommend replacing perpetual strawbs annually  so wouldn't have thought that they're better - specially for your pocket as they don't grow many runners. They list Aromel as far as variety is concerned.

http://apps.rhs.org.uk/advicesearch/profile.aspx?pid=306