If you have set your image links to have a uniform height, and can guarantee that descriptions and all other lower elements will be uniform, that leaves only the item name. Will some products have names so long they wrap to two lines? Will you have some additional text or icon in certain products but not in all or most products? You may be able to set the product boxes to a fixed height and use CSS to keep the qty box at the bottom.
Identifying all the elements that might change can point to the best way to control the whole listing display.
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