Obviously tea has other benefits, but I bought some caffeine tablets off myprotein for a measly $3 or so. 200 tablets, each worth a cup of coffee. With some morning Theanine, a perfectly smooth morning boost. Zero intestinal or full-stomach effects coffee + creamer (especially ones with artifical sugar) can bring, for a fraction of the price. And no teeth stains of coffee.
You were right, myprotein has dirt cheap stuff. Bought about 5 items, protein, creatine, caffeine, a nootropic stack, and a mixer mug for a ridiculous $35 or so.