Rigid fork. Where from?

Bit stuck on the sheer number of options so where’s a good place to buy a decent, inexpensive (rather than cheap!) rigid fork? My MTB is a Btwin rockrider 520 and the fork on it is appalling. So thought I’d look into replacing it with a rigid number since it’s only going to get used on light trails/road with the kids etc.
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What usage, if you're using it mostly on road/smooth gravel then Mosso forks are great.
For more off road there are a few options depending on budget (?)
Is yours the older 26" or the newer 27.5?