{"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":"2026-11-11T04:11:08+00:00","price":"79.00","retailer":"Amazon UK","source_kind":"offer_check","source_url":"https://www.amazon.co.uk/dp/B07L4TMHRN?maas=maas_adg_api_584955703333686768_static_12_201&ref_=aa_maas&tag=maas&aa_campaignid=PBdd5e46c7ec568c9a30ee9a425b4054a9_32f12f7366bb&aa_adgroupid=d0c115b0446317f0a666483565b2b55f_PBSEP_!!!affid!!!_118045_&aa_creativeid=3601K1T2MwK_agE2y3fWqjLeS6uRKAQx69mfOFyHPAJxQebY_c"}],"product":{"brand":"Fosi Audio-UK","evidence_url":"https://www.mainbuyer.com/evidence/products/fosi-audio-box-x4-phono-preamp-headphone-amplifier-preamplifier-hi-fi-pre-amp-with-jan-5725w-vacuum-tubes-for-mm-turntable-phonograph-record-player-with-volume-bass-treble-control-b07l4tmhrn/prices","gtin":null,"id":22463,"model_number":null,"name":"Fosi Audio BOX X4 Phono Preamp Headphone Amplifier/Preamplifier Hi-Fi Pre Amp with JAN 5725W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control","product_url":"https://www.mainbuyer.com/product/fosi-audio-box-x4-phono-preamp-headphone-amplifier-preamplifier-hi-fi-pre-amp-with-jan-5725w-vacuum-tubes-for-mm-turntable-phonograph-record-player-with-volume-bass-treble-control-b07l4tmhrn","urn":"MB-AWIN-GB-B07L4TMHRN"},"summary":{"currency_code":"GBP","currency_symbol":"\u00a3","has_history":true,"historical_high":"79.00","historical_low":"79.00","last_observed_at":"2026-11-11T04:11:08+00:00","low_30d":"79.00","low_90d":"79.00","median_price":"79.00","observation_count":1,"priced_observation_count":1,"retailer_count":1,"span_days":0,"tracked_since":"2026-11-11T04:11:08+00:00"}}