https://creative.adobe.com/products/photoshop also photoshop cc is 9.99 a month at the moment https://creative.adobe.com/plans/offer/photoshop+lightroom
Yeah, though Petrol/Blood does have a barrier of entry which is why I know I'm not participating since Photoshop specifically is a requirement to use the Quixel suite.
A 30 day trial of Photoshop should be enough to cover some texturing time, and it isn't a requirement to use the Quixel suite for everything as long as you use it somewhere along the way. And since Adobe's about to add a large amount of new things it's likely they'll be resetting trials if you've used it already.