Before you give up on whites, try playing around with the steeping time and temperatures. Adagio recommends 180 degrees Fahrenheit with a 7 minute steep, but I prefer a 2 minute first steep and others prefer a 15 minute stew. You might get better results at 165F or 190F...it's all up to your palate.
If you do want to wean yourself onto whites through flavors, look around the internet before settling on Teavana. They are very over priced. If you do want the exact Teavana blends, try SpecialTeas
. They both sell many of the exact
flavored blends that Teavana does (all three have the same wholesale supply), and they offer much better prices. ($120 lb for Teavana's Honey Dew White--$38.80 lb for SpecialTea's Casablanca Melon White, and they really are identical). You won't be able to find Teavana's entire catalog...but you can find most of it.
Don't discount Adagio! They sell four white flavors, which seem to have pretty high reviews.