they vary in price. I have my Hannants price list here at work so if
you mail me with which datafiles you want i will return the prices.
The prices you quote range from 8.50 pounds to 20 pounds, and the
prices in the list range from 5.50 to 18.5 (for the gotha specia
which is far and away the most expensive). BTW these prices include
VAT so if you mail ordered these the VAT would be deducted. Also if
you purchse them at their shop you could reclaim it at the airport
but that is possibly complicated.