I've been working the past couple of weeks to something very similar!
I made an excel sheet which collects all the data from your shop and generates a catalogue for your petpage.
You can see the result at www.neopets.com/~drolleke
The links work for my page, but if you want to use it for your own page, you'll need to enter the id's for every single item.
I'm now working on an option to collect the item id's automatically.
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