38t cassette?

I know sram do the huge cassette range of 11-42 but do any other companies do soething along them lines. Recently bought a 29er with 10x3. Wanted to make it 10x1. Wanted something slightly larger than the 36 on the rear. Ideally a 38. Any suggestions. I've got an XT cassette so pretty sure the top 3 sprockets are all joined do any companies make a set up so i could just replace the top 3 of the cassette?
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More gear than you require but maybe they do a smaller one?
KCNC do an 11-38, but they're expensive and censored .
That half a gear might just make the difference though. Just seen the price of them at £379 i would rather try a little harder in bigger gear. Good for a weight weenie though!!