So called, because the contestant had to "buy" or "sell" three prizes and make a profit out of the deal in order to win all three prizes and a possible cash bonus.
- The contestant was shown three prizes, each with an incorrect price either above or below the actual price. One by one, the contestant had to determine whether to "buy" or "sell" a particular item. The goal was to "profit" by buying under-priced items, and selling overpriced items.
- After all three decisions were made, the actual prices were revealed one at a time. For a correct decision, the difference between the two marked and actual prices was added to a bank. For a wrong decision, the difference was subtracted from the bank.
- After all three prices had been revealed, if the contestant had a positive total in the bank, he/she won all three prizes plus the bank total in cash. "Breaking even" (finishing with $0 in the bank) was considered a loss, although the prices were usually chosen to prevent this from happening.
- On its first playing, it was won.
- The cash bonus was not added to the game until October 30, 1997. The highest cash award possible in the game was $1,900, since the differences used are always multiples of $100 and the tote board could not display anything larger than "1" as its thousands digit. The highest amount of $1,900 was won three times.
- Buy or Sell's tote board was staged in several different locations over the course of its first few playings. Later, the digital readout on the board was changed from pink neon lights on a blue background (similar to what Super Password used to display the jackpot amount for the bonus round) to greenish-blue LCD digits displayed on a black background, as the original tote board was hard to read. In the first few times this game was played, the purple base of the Buy or Sell tote board was much taller than it was later on.
- The most number of times this game was played in any season was 20.
- Buy or Sell was retired because too many contestants were confused by the concept of the game; not helping matters was the staff disliking the game itself. Strangely, the last time it was played, the price display was not working.