There is possibly a demand on E-bay. I have purchased lab equipment and supplies on E-bay with great success. What type and age of SAT/IN boxes do you have?
There are second hand labsuppliers. Just try to search at the internet for "used/second hand lab equipment" Possible could you trade it in here:
(I am not associated in any way with this company - I picked it cause I know it, but I do not have experience with it to share. There might be others, and the example might not be the best offer. Please check first for yourself)