$600 AU back in 99 for the 98/99 Upper Deck Gold 1/1 base card. Those were the days when 1/1s were actually impossible. A mate of mine saw it at a card show in th US and snapped it up for me so I didn't really have a say in if I would buy it! But he knew I'd come through with the goods. Its actually the biggest regret aswell as I sold it in 2001 to another Walker collector as I BADLY needed some funds. Didn't lose anything on it but I wish it was still in my collection!!!!
Back in 98 I regularly spent $100-$150 US on Walker parallels such as Rubies, Credentials, and Grand Finale etc. Although the last few years my biggest spend has been a bit over $100 US for my logoman. I picked up all my lettermen for $60-$80US and appart from that most Walker's appart from 1/1s sell for under $50 US.