You did very well indeed, ME.
I have just checked my collection and established the purchase price for four of those books:
Llandudno – Events, People and Places over the last 100 years - £14.99.
Llandudno, Queen of the Welsh Resorts (1st Edition) - £3.95
Llandudno, Queen of the Welsh Resorts (2nd Edition) - £15.95
Llandudno – A portrait in Old Picture Postcards - £5.95