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Fair enough, I do remember buying some specialized tubes for around £4 - £5 in Cycles UK Greenwich about 10 years ago so maybe £7 - £8 from a LBS these days is totally acceptable.
I do always try and repair a tube as many times as possible but when old repairs start failing etc I tend to replace / like to carry a spare.
Went tubeless for commuting much prefer the feel and had no issues with punctures / sealant, when my deep rim wheels die I doubt I will use inner tubes on a modern road bike again.
Still £2.99 in decathlon (maybe not with 60mm valve), pretty sure I paid no more then £1.99 in 2001 so £3 - £3.50 would seem more inline with inflation then £7?