Hello,
What are the rules about selling unneeded VEX parts on here? Like 2 things.
Coach Peterson
As far as I know there aren’t any special rules regarding selling VEX parts on VEXforum. From time to time people post threads offering to sell some of their extra VEX things.
Examples:
https://vexforum.com/t/vex-for-sale/17598/1&highlight=sale
https://vexforum.com/t/parts-for-sale/15684/1&highlight=sale
You are certainly allowed to try try - Whether you can is different question. 
Whatcha got to selllll? And prices too please.
-Dave
Sorry about the huge photos, not sure how to shrink them.
I have 2 large blue batteries for the old joystick remote. http://www.vexrobotics.com/276-2220.html http://www.vexrobotics.com/media/catalog/product/cache/11/image/5e06319eda06f020e43594a9c230972d/B/a/Bat96v_2.jpg http://www.vexrobotics.com/media/catalog/product/cache/11/image/5e06319eda06f020e43594a9c230972d/2/7/276-2220-9.6v-battery-in-transmitter.jpg
New these cost $20. We used them for about 6 months but not very heavily, and only at one competition. So I would sell them for $10 each plus shipping.
And a USB cable that is grey instead of yellow like in this image. http://www.vexrobotics.com/276-1403.html http://www.vexrobotics.com/media/catalog/product/cache/11/image/5e06319eda06f020e43594a9c230972d/2/7/276-1403-USB-a-a-cable.jpg This one is still in the package. New it is $9, we would sell it for $7.
We also have the complete Round Up Game Board supplies. http://www.vexrobotics.com/276-1556.html
Including the ladder, flags, and the 5 weighted goal bases and a full set of tubes, we used up the tape. We would take the best offer on the game board parts. They are scratched a bit but still fully functional. New the whole set was $500.
Thanks!
Coach Peterson
I’ll take a MWB and 4 tubes for $20