The Electric Prunes - Shadows Promo only 45

Nope. would never pay that much either. Not my fave Prunes tune, it is good but ain't better than the $20 "Hideaway" Reprise 45, lol!

Once you pass the $2,000 threshold, it is very difficult to sell anything US 60's garage related for more money, except in a few cases. Something like the Keggs, Greg Barr & the Bar Association, Just Too Much are three 45s that would approach the 5K mark, those seem to be unobtainable at any price. I'm talking about true collectors and not the DJ rent-a-record types.
 
I paid $1500 for my mint copy in a private sale several years ago. I suspect that the collectors who would pay more than $1500 already have it.

Good luck.