Thinking around this much, although it varies calculator to calculator:
$050-070 - TI 89t
$040-060 - HP 50G
$100-120 - HP Prime
Can do payment through Amazon or Paypal.
Update: I have since purchased a HP Prime since I needed a good calculator urgently. Still interested in the above two calculators but I am a bit more picky about pricing now.
Edited by Ryleh - 10/24/13 at 1:06pm