I researched this a little bit a while ago.
There are multiple UK shoe seller sites offering wooden boxes containing kits at roughly similar price points. If you hunt around you will likely find that the boxes concerned can also be bought by themselves from various vendors, so after that it's a question of working out which site is offering the best overall price for the box plus the contents...
I wanted an unbranded box, and Saphir contents. That steered me a bit. Can't actually recall who I went with but it has been a reasonably good purchase.
If I am honest I would be happy with a less prestigious brand than Saphir, were I buying again. I don't think they are that much better, for the money.