Had quite a few bargain finds over the years, but one of the best soul ones was "It'll Never Be Over For Me" by Timi Yuro on UK Liberty - found in Greenwich market for £1 one Sunday afternoon in January 1989. Swapped it two years later with Dawn Brown for The Arcades on Triad.
Also had "We Got To Start Over" by The Turbines on Cenco from a US list for $10 in 2001. Coincidentally, it went to Nick Brown (Dawn's husband) for £800 worth of trades a few years later, amongst them a lovely mint Eddie Foster on In.