[POWER RANGERS] Does anyone collect preproduction or prototype items?

Hi all, just curious if anyone here collects prototypes or preproduction material for the 1993-1994 Power Rangers line.



Do any of the more advanced collectors have experience with prototypes and samples?



I've tried searching online however there doesn't seem to be many data points for previous sales so I was wondering if anyone here may be able to help.



Thanks in advance.