Mountain is good as PilotDog68 recommended, but they only have unprotected cells in stock...
You can get the inferior UltraFire/TrustFire protected cells, but good luck getting cells from overseas sellers now.
See this post regarding the shade of red on the E09...https://budgetlightforum.com/t/-/18053#comment-377438
<Edit>
Some reviews say the Red E09 is more of a pinkish-purple, not a true "MagLite Red".
