Couple of modern ones spring to mind for me, Vivian Reed 'Save your love for me' (Atco) and Almeta Latimore 'These memories', love them both to bits and seen quite a few times but never got round to buying.
Part of the reason for this I think is that sometimes after loving and wanting a record so much, it's then something of an anti-climax when you do buy it - almost like the journey is better than the arriving. Wade Flemons 'That other place' (Vee Jay) for example, played it so many times on tapes, etc, that when I finally bought the 45 I'd had enough of it - almost like the magic went as soon as I owned a copy