{"dataset":"MainBuyer UK price observations","market":"GB","market_name":"United Kingdom","methodology":"Each observation is stored only when MainBuyer has a timestamped checked retailer offer. Missing days are not interpolated or invented. Historical low, high and median figures use recorded in-stock observations only.","observations":[{"currency":"GBP","in_stock":true,"observed_at":"2026-09-17T12:30:46+00:00","price":"199.99","retailer":"Amazon UK","source_kind":"offer_check","source_url":"https://www.amazon.co.uk/dp/B0DDWY7HYJ?maas=maas_adg_api_584985215261907273_static_12_201&ref_=aa_maas&tag=maas&aa_campaignid=PBd3060ec4b5db4ac5d262154a04c9e8f1&aa_adgroupid=4cfea1204395aa01d4094d7bbca22c6d_PBSEP_!!!affid!!!_118045_&aa_creativeid=9de7OZI0iJI3rmOwEzZiD_brg9lsi2QXY7_aWRqKv0WPlq4ZU_c"}],"product":{"brand":"SIHOO UK","evidence_url":"https://mail.mainbuyer.com/evidence/products/sihoo-m59as-ergonomic-office-chair-dual-backrest-adaptive-lumbar-support-b0ddwy7hyj/prices","gtin":null,"id":13164,"model_number":null,"name":"SIHOO M59AS Ergonomic Office Chair, Dual Backrest, Adaptive Lumbar Support","product_url":"https://mail.mainbuyer.com/product/sihoo-m59as-ergonomic-office-chair-dual-backrest-adaptive-lumbar-support-b0ddwy7hyj","urn":"MB-AWIN-GB-B0DDWY7HYJ"},"summary":{"currency_code":"GBP","currency_symbol":"\u00a3","has_history":true,"historical_high":"199.99","historical_low":"199.99","last_observed_at":"2026-09-17T12:30:46+00:00","low_30d":"199.99","low_90d":"199.99","median_price":"199.99","observation_count":1,"priced_observation_count":1,"retailer_count":1,"span_days":0,"tracked_since":"2026-09-17T12:30:46+00:00"}}