Where to Buy Seeds?

I seem to be obsessing over this question.  There are many companies selling their seeds on the internet.  Then there are the local garden centers and even Walmart.  I keep going back and forth on where to buy.  Why?
1.  I want a good price.
2.  I want seed that has a good germination rate.
3.  I don't want to pay a huge amount for shipping.
4.  I am concerned by the amount of seeds in a packet.  Just how many seed are in .2 grams?
5.  Can I get a coupon or promotion code?

Today on my way to my daughter's piano lesson we stopped in Walmart for a few necessities and I took a quick look at their seeds.  They were Ferry Morse and cost $1.27, but I have no idea how many are in the packet.  I haven't had the time to get by our local garden center.  They usually carry Burpee seeds.

I enjoy reading Mother Earth News.  They had an article a couple years back about the top rated seed companies.  I decided to pick one herb (genovese basil) and do a price comparison using these companies.  Here is what I discovered -

Johnny's Selected Seeds      
$3.45 packet (200 seeds) shipping $6.75 for under $30
Promo code 13-1014 to get free shipping

Seed Savers Exchange
$2.75 packet (250 seeds) shipping ??? too difficult to find
No Promo codes found
(Did find reviews that talked about really high shipping rates.)

Baker Creek Heirloom Seeds
$8.00 packet  (1 ounce)  shipping $3.50 for total order
No Promo codes found

Southern Exposure Seed Exchange
$2.10 packet (254 seeds) shipping $4.50 for under $30
No Promo codes found

Botanical Interests
$1.89 (1.5 ounce)  shipping $3.95 for under $50
No Promo codes found
(The seed packs themselves have beautiful artwork.)

Hmm,  Johnny's, Southern Exposure, and Botanical Interests all seem possible.  Now I need to check what my total would be from each of these places for the herbs that I want -
basil
oregano
chives
lemon balm
chamomile
spearmint
lavendar
catnip
I think I'll wait on that until another day.  It is getting late and just doing this much research seems to have helped ease my nerves.