I've always ordered ink from inkjets.com because it's cheap and their cartridges are completely clear so you can actually see that they're full of ink like you'd expect.
You wouldn't ban the teaching of material science to a future civil engineer.
You wouldn't ban the teaching of chemistry to a future pharmacist.
You wouldn't ban the teaching of aerodynamic sciences to a future car designer.
Why would you ban the teaching of gender identity and sexuality to a future psychologist if it's a core piece of knowledge required to excel at their profession?
I've always ordered ink from inkjets.com because it's cheap and their cartridges are completely clear so you can actually see that they're full of ink like you'd expect.