I don't think you can delete them yourself. You need to write to support. Mostly likely they make it difficult because it screws up your reports.
Well, I think I'll just re-use them then. Imagine tracking ID totally different from product I'm selling...Oh well...
You can't delete your ID, I cofirmed Due to amazon doesn't have the system to support for Tracking ID deleting. Maybe because of too much members, and such a long run system, can't just fix in a day. Maybe too difficult to do. Anyway this is my personal opinion ^_^
Just many company don't give out delete privileges to db. So they just don't do it. BTW check my site: http://www.nukeprice.com
I think Tracking ID cound not be deleted is the good thing Due to I ever run so many blogs and after something wrong, blogs hosting provider dump me and deleted all my blogs. After that I realized and noted to myself, Nothing free or real free in this world. And I never get back to run any block with that provider again, in opposite, I start hosting and register my own domain. The Tracking ID also, the same way If Tracking ID can be deleted, some time in future, May have something occur, and the aStore with good keyword namely in aStore will be replaced, stolen and grabbing from someone. I think the exist benefit of aStore is the most useful.
Why not reuse them, it does not occupy any of your space and it only takes a few minutes to create a small niche stores which you might earn something from.