I’m interested in buying the whole lot if you want to sell all to one person!
For individual sales: I have found Vinted to be a great place to get quick sales of Gymboree! Vinted does not take seller fees. Also Gymboree BST on Facebook! If you want links or help with anything let me know!
Here is my email if you need any help with pricing anything: jessannlarson@gmail.com
But I usually look up sold comps on Mercari or EBay! You can use Google reverse image search too!
Best, Jess