Fetch the purchasable offers for a retail product by URL or product ID, with ACCURATE Amazon Prime eligibility, fulfillment (FBA), availability, seller, and the per-offer shipping price — unlike product search, which runs logged-out and under-reports Prime. Returns each offer plus a recommended bestOffer (cheapest available, preferring free shipping / Prime) and, when shipping is known, a cent-accurate order quote. Ideal for: confirming Prime/fast shipping before ordering, getting an exact pre-checkout quote, deciding whether an item ships free.
