You could buy a pair of Tufo S33 PRO with a removable valve core (beige sidewall 24c, have good reviews), Tufo Sealent and rim glue from Wiggle for about 50 GBP and have them delivered for free.
But then you'd have to ride Tufos...
It's obviously a budget option, but what is so wrong with it (sincere question)?
@umop3pisdn started
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You could buy a pair of Tufo S33 PRO with a removable valve core (beige sidewall 24c, have good reviews), Tufo Sealent and rim glue from Wiggle for about 50 GBP and have them delivered for free.