Okay, so far I have ordered booster packs and boxes from the following places:
dacardworld.com
pokeorder.com
abctoy4me.com
trollandtoad.com
collectandsave.com
thegatheringground.com
Out of the six, dacardworld and trollandtoad were the most reliable. Pretty cheap prices, and they use UPS delivery(dacardworld offers free ground delivery if orders made on Thursdays are $50 or more, and free shipping on other days if you spend $150 or more). Trollandtoad has a great collection of booster packs, and cheap too. The shipping costs makes up for that though
. Got emails about tracking status quickly from both websites. Look for coupons online to decrease the overall prices of both websites.
Next is collectandsave. There was a bit of a credit card issue I had with them, but it was resolved in a week. The 25 dollars off (first time ordering from them)and free shipping coupons should make this place top priority if you're looking to save on booster boxes.
I was a little suspicious of the packs I got from abctoy4me. I ordered 5 secret wonders packs from them on amazon, and got it within two days(we're in the same state). No regular holos out of any of em, and the reverse holos had these long vertical lines in the middle.
Lastly, the worse place thus far, pokeorder. I placed an order over 3 weeks ago, and still haven't got the shipment. There's no phone number to contact them on their website, and they rarely respond to emails. I had to do some searching and found the owner of the website and emailed him and got a response. Too little too late, as I placed a complaint on them via better business bureau.
I placed an order over at thegatheringground a few days ago, so I have no information about them yet, though they haven't sent me an email regarding my tracking number which they're supposed to do.
I haven't ordered from pokecorner.com, but it seems like they are very reliable from what I've been reading. I hope this helps.