Sorry if this has already been suggested :p
my suggestion is that you could make the marketplace easier by making a page per item seperately if you go through find items.
because if you go to EF for example you get all possible EFs with their price.
What i mean is that it would be easier that if you clicked EF that then you need to click the kind of ef u want and then you see the EFtype you chose plus their prices
e.g. Find items> Part type: Energy Field> Zephyr(maybe >+1,2,3,4 but that would be alot of work) and then you get al Zephyr EFs
This could be impossible for you guys sorry for suggesting then
Just thought this would be a good idea if possible