128GB SDXC (or micro with adaptor) for 4K video

I've been searching for a deal on the Lexar 633x microSDXC with adaptor or try Samsung EVO Plus microSDXC with adaptor.

Previously CentreCom had these for $15, however the price has increased to $20.

The Samsung Evo Plus 128GB always seems to go on sale but never when I need it.

Does anyone know of any deals that would be suitable?