The original Avalanche series were fairly weak ball, better suited for fairly dry conditions. With some exceptions, the line really didn't seem to me to sell very well. SO many people want only hook monsters. I liked the Avalanche Slide so well for really dry conditions, I bought a 2nd as a backup.
And I still use the Avalanche (pearl) urethane. That weak core is perfect for urethane balls.
Any other Avalanches will only be found rarely and on Ebay these days.
"None are so blind as those who will not see."