{"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":"2026-10-03T19:11:36+00:00","price":"539.99","retailer":"Amazon UK","source_kind":"offer_check","source_url":"https://www.amazon.co.uk/dp/B0HBWT48DR?maas=maas_adg_api_584985215261907273_static_12_201&ref_=aa_maas&tag=maas&aa_campaignid=PBd3060ec4b5db4ac5d262154a04c9e8f1&aa_adgroupid=2d91a2f7563ff6a73439f5f4df1ea819_PBSEP_!!!affid!!!_118045_&aa_creativeid=4963VSa8wLo5BBzO5kKlPn2SaemcF3lXxTapRlVkIGIsiWU_c"}],"product":{"brand":"SIHOO UK","evidence_url":"https://mainbuyer.com/evidence/products/sihoo-b300-pro-ergonomic-office-chair-with-footrest-4-way-lumbar-support-b0hbwt48dr/prices","gtin":null,"id":15437,"model_number":null,"name":"SIHOO B300 Pro Ergonomic Office Chair with Footrest, 4-Way Lumbar Support","product_url":"https://mainbuyer.com/product/sihoo-b300-pro-ergonomic-office-chair-with-footrest-4-way-lumbar-support-b0hbwt48dr","urn":"MB-AWIN-GB-B0HBWT48DR"},"summary":{"currency_code":"GBP","currency_symbol":"\u00a3","has_history":true,"historical_high":"539.99","historical_low":"539.99","last_observed_at":"2026-10-03T19:11:36+00:00","low_30d":"539.99","low_90d":"539.99","median_price":"539.99","observation_count":1,"priced_observation_count":1,"retailer_count":1,"span_days":0,"tracked_since":"2026-10-03T19:11:36+00:00"}}