Over the last couple of months I have twice placed an order, cancelled it, then placed (and went through with) another one. There are a couple of things that I found very irritating:
- there is no way to suppress the "not for sale" entries. Wading through 30 or 60 pages of stuff and having half of them not for sale is frustrating. Even just being able to sort them to the end of the list would be an improvement.
- the "store credit available" field in the ordering dialog is very small and easy to miss - I certainly did the first time round, and effectively ended up paying twice after cancelling my first order. I eventually used this credit for my second order, so no harm done in the end. Making it much more visible, or a popup asking whether to use it or even always using it by default would be a great help.