Where can I find this exact spatula, with a short handle and asymmetric head?

I couldn't find an exact match but the short, squat shape with a straight top edge suggests that it's for stirring and/or scraping. The flat shape (ie. that although the head is angled at the top, the whole head isn't angled) and thick, inflexible design suggest that it isn't supposed to be used for flipping; this would be very difficult as rim of the pan would get in the way - even if it weren't a problem, you would still have the problem of your knuckles being too close to the pan to avoid burning.

The nearest equivalents I could find are:

A Saute paddle:

This is probably the best match. The tool that OP pictures seems good for scraping a pan and will take some force being applied. The angle at the top will also make this easier on the wrist. Slots are also common.

Or, failing that

A Rice spoon/spatula:

The overall size and shape are close to a traditional rice spatula/spoon. The angled head is a common design, though less common than round heads. Slots however, are unusual.

That looks like something made for Walmart or target or the like, however that style of spatula looks like a "slotted nylon broad fish turner" google that and variations of that as a search term to find a good match.

I don't know why fish turners aren't more popular in the average home, but they are great tools. Since I don't use Teflon coated pans I prefer stainless, but even so they are great flipping tools.