Thanks, is there a how to somewhere to avoid that in the future?
Are you using the Amazon app?
I don't use it so I'm not 100% sure, but I understand they periodically make it more difficult to avoid the a.co link.
(They probably like the social tracking part).
If you're in a web browser though, it's pretty easy to just copy the link from start through the ASIN, ignoring the rest of the tracking info.
ETA:
I guess you could copy the a.co link from the app, paste that in a browser, then copy the relevant part of the new link.
There might be an easier way.