Tiagra 10spd mech £9.99
https://www.wiggle.co.uk/shimano-tiagra-4700-10-speed-rear-derailleur-gs?lang=en&curr=GBP&dest=1&sku=5360714283&utm_source=google&utm_term=&utm_campaign=&utm_medium=base&gclid=Cj0KCQjwjbyYBhCdARIsAArC6LJADn9ascrKkfriMYtStnWxKHIp9tShSiqIcF7K5d8Dyfn1aFA2eggaAlxoEALw_wcB&gclsrc=aw.ds
Sora 9spd mech - £9.99
https://www.wiggle.co.uk/shimano-sora-r3000-9-speed-rear-derailleur?lang=en&curr=GBP&dest=1&sku=547400&utm_source=google&utm_term=&utm_campaign=&utm_medium=base&gclid=Cj0KCQjwjbyYBhCdARIsAArC6LJDO035OsXBIpjM3jENuUQ3AwjpA_x5CO1nkR7D0WLg7_WhI-5-s_8aAj9yEALw_wcB&gclsrc=aw.ds
Good prices. FYI: That tiagra 4700 is the weird pull ratio version that only works with other 4700 versions and nothing else.
I swear I remember hearing that the pull ratio will work with 11 speed shifters, might be wrong though, never tried it!
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Tiagra 10spd mech £9.99
https://www.wiggle.co.uk/shimano-tiagra-4700-10-speed-rear-derailleur-gs?lang=en&curr=GBP&dest=1&sku=5360714283&utm_source=google&utm_term=&utm_campaign=&utm_medium=base&gclid=Cj0KCQjwjbyYBhCdARIsAArC6LJADn9ascrKkfriMYtStnWxKHIp9tShSiqIcF7K5d8Dyfn1aFA2eggaAlxoEALw_wcB&gclsrc=aw.ds
Sora 9spd mech - £9.99
https://www.wiggle.co.uk/shimano-sora-r3000-9-speed-rear-derailleur?lang=en&curr=GBP&dest=1&sku=547400&utm_source=google&utm_term=&utm_campaign=&utm_medium=base&gclid=Cj0KCQjwjbyYBhCdARIsAArC6LJDO035OsXBIpjM3jENuUQ3AwjpA_x5CO1nkR7D0WLg7_WhI-5-s_8aAj9yEALw_wcB&gclsrc=aw.ds