Good Tobaccos... subjective to taste... but some of the more popular ones by tobacco enthusiasts include:
Alien Visions Boba's and Marly, Backwoods Brew - honey flue nut, Vapor Station's Tampa, Tenn, Frisco, NHaler (never tried, but hear excellent things, freedomsmokesusa (wyatt erpp), HALO freedom and LiquidXpress original and honey flue to name a few...
Some people love Dekang... very inexpensive...
Non-tobacco I think vaporbomb,tasty vapor and mrs. T's are delicious - great service.
A lot of folks are happy with Viking Vapor as well...
In any case... scroll to the last part of the forum home page.
These vendors have forums of their own. Read them and see what everyone is raving about or keep reading reviews... Your question is a good one... asked frequently. I asked it a few months back and it lead me to some great choices...
As far as shipping goes... I wouldn't sweat it. It's not like eBay where some cheap jerk is charging an arm and a leg...
I doubt sellers are trying to make money off of shipping...
Some might be absorbing or offsetting costs like CC processing, mailing supplies etc...
Vapor station charges me 6.00 for shipping... and that's 4.95 flat rate priority plus .70 tracking and I am fine paying the extra .35 for the love... or my cc processing or the bubble wrap or the gas money for him to drive to the po... whatever ;-)
One thing you'll come to appreciate is good service... $7.00 for priority/tracking/secure packaging is worth it to me if the service is good.