Not sure of an alternative, but I get these in packs of 6 for £15 on Amazon. Sorry not to be of more help!
@Bec ah I didn’t even think of Amazon. And that really is a help thank you xx
Home bargains have then for £3.50 for 2 x
Is it like a straighter teat? My daughter would only take this one tomme tipped one we got with her bottles. Only ones I found similar were boots own ones! She took those easily as they didn’t have the big rounder bit on the teat x