LEGO 10300 Back to the Future Time Machine (new, sealed) vs LEGO 10302 Optimus Prime (new, sealed)
LEGO 10302 Optimus Prime (new, sealed) typically costs $5.59 less than LEGO 10300 Back to the Future Time Machine (new, sealed) on eBay right now ($213 vs $218 median asking price, item + shipping). Per piece, LEGO 10300 Back to the Future Time Machine (new, sealed) is cheaper: $0.12 vs $0.14. Prices from filtered US eBay listings, checked twice a day; asking prices, not sold prices. How we price.