Discover admitted marketplace sources for a canonical product ID from search_products, then verify each returned offer through Chip's exact-source commerce gate. If variant_id is omitted or null on a variant-bearing product, returns selection_metadata_not_offer options; unsourced specs stay unknown. Supply the exact variant UUID to get offers. Two sources checked per page within a bounded 16-source live window, use next_offset; this is not exhaustive catalog coverage or a stable snapshot. Results retain golf-offer.v1, including check_price and unknown currency. No member actions or click attribution. Deployment may be disabled (503). Every price carries observed_at and expires_at; do not quote after expires_at.