Is Other World Computing's 1.5TB Toshiba Aquarius laptop hard drive legit?
Other World Computing is a very reputable Apple specialist and I don't doubt that the Toshiba drive is compatible. If they list your particular Macbook Pro in the compatibility list, then it surely should fit. And the description mentions 12.5mm height which also confirms it should work.

And a quick Google search on the Toshiba part # MQ01ABD150 yields several results on other availabilities of that drive, albeit more limited than many smaller capacities.

It's worth noting that it is a 5400rpm drive and not 7200rpm, which you would be even less likely to find, if 7200rpm drives at that capacity even exist in the notebook compatible (12.5mm height or less) variety yet.