{"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":"2026-09-17T12:27:30+00:00","price":"299.99","retailer":"Amazon UK","source_kind":"offer_check","source_url":"https://www.amazon.co.uk/dp/B0HHN1K96D?maas=maas_adg_api_584985215261907273_static_12_201&ref_=aa_maas&tag=maas&aa_campaignid=PBd3060ec4b5db4ac5d262154a04c9e8f1&aa_adgroupid=5aae4ff43632ca0b83cd8319ab1d6d31_PBSEP_!!!affid!!!_118045_&aa_creativeid=57eaXXVD2L7Z_bsbxaLPkqom3murVwlUIL_a0Vl6owoFLgU80_c"}],"product":{"brand":"SIHOO UK","evidence_url":"https://mainbuyer.com/evidence/products/sihoo-b300-pro-ergonomic-office-chair-adaptive-lumbar-support-soft-black-b0hhn1k96d/prices","gtin":null,"id":7635,"model_number":null,"name":"SIHOO B300 Pro Ergonomic Office Chair, Adaptive Lumbar Support, Soft Black","product_url":"https://mainbuyer.com/product/sihoo-b300-pro-ergonomic-office-chair-adaptive-lumbar-support-soft-black-b0hhn1k96d","urn":"MB-AWIN-GB-B0HHN1K96D"},"summary":{"currency_code":"GBP","currency_symbol":"\u00a3","has_history":true,"historical_high":"299.99","historical_low":"299.99","last_observed_at":"2026-09-17T12:27:30+00:00","low_30d":"299.99","low_90d":"299.99","median_price":"299.99","observation_count":1,"priced_observation_count":1,"retailer_count":1,"span_days":0,"tracked_since":"2026-09-17T12:27:30+00:00"}}