Clip Studio Paint is fantastic. Desktop is a simple purchase and they usually have deals up to 75-80% off.

The paid subscription for iPad isn’t too bad either. You can buy an Apple gift card and that’ll get you squared away.

Affinity Design and Procreate are also solid one time purchase apps. Very inexpensive.

Blender is powerful.

My friends studio did the VFX work for Man in The High Castle series all in Blender. It’s got a steep learning curve, but it’s worth it.