The Warsun CT9T, available at BG US warehouse is effectively a deep C8 reflector light at $20, $18.35 after BLF code. It's a different form factor - side switch, little bigger all around, etc., so not sure it suites your needs.
I don't have one right now, but have a couple of X60's (26650 size) - same, but different 
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Weird - the deep C8's were quite popular for a while. Hhmm, the SupFire C8 size lights also had a deep reflector. Not sure bout the SupFire L6 Richard sells, if it's a deep reflector or not - I got one @home, but it's a 26650 light.
Edit: Ohh, my BLF review of the L6 here: https://budgetlightforum.com/t/-/26046, states it is a deep C8 reflector 
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