Paid $6.50 to see Jefferson Airplane. I'm a little fuzzy on the exact year, only sure it was before '70.
By the time prices were getting over $10, a lot of the music was heading south anyway.
On the www.dinovalenti.com website, they have posters of concerts Quicksilver was in. One show had the Dead, the Airplane and Quicksilver for...$3. Pretty amazing!