Do you want the most expensive NES collectible imaginable? Forget that Stadium Events business, and check out this $150,000 auction for a US prototype of The Legend of Zelda. eBay seller tjcurtin1 has a Nintendo of America prototype, dated "2-23-87," up for auction, with a sealed copy of the retail release thrown in for good measure.
"This is a complete version to my knowledge," the seller says, "and as far as I know does not differ from the released version." That means it lacks the differences found in the Famicom Disk System prototype that was released freely online, and is thus valuable solely as a collectible. Keep that in mind while applying for loans.