I currently have a teachers subscription ($20 mo) is the cost of Stock on top of my current subscription or is the $29 a new rate that includes the cost of CC and Stock?
So in another way of viewing it.
Currently paying $20 +tax mo. (Teacher edition CC)
will a 10 photo license subscription bump that to $29 +tax mo.
will it be $20 + $29 = $49 mo.
This is not clearly stated in the purchasing options.
The stock plan price of $29.99 is added to your existing Creative Cloud plan - so, in your case it would be $20/month for the Student/Teacher plan + $29.99/month for the Adobe Stock plan.