I was going to suggest Holden's Landing, they're a very similar shape to FFs and there are a fair few about, though they do tend to get snapped up quickly . Ditto for Hollow Oak.
You might find Swaddlebees a bit cheaper, and they're lovely - I loved the sized fitteds on Lili when she was a bit smaller but gave up on them when she needed to go into larges as they didn't fit quite right. The OS fitteds still fit her perfectly though.
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