Had difficulty buying one item i.e. the Cute Panda beanbag. Almost hidden by the item underneath. Finally got it but had to find exactly the right spot to click:

(latest firefox ESR 1680X1050 resolution with win 7 pro 64 bit)
I had exactly the same issue with that beanbag, I had to zoom out several times to find the 'buy' button.
Is this still an issue you are noticing?
I still experienced this last TS restock.
Do you recall which browser it was on?
We have an update scheduled for late January that may fix this. Until then there is a customCSS you can use.
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It's no big deal anyhow. Just make the window full size for an instance for the purchase.
rofl @ your pet! :-)