I only order from Canada. I see no need to pay rip off prices. This is a very legitimate multi million dollar business but like anything off the web you have to be a cautious.
I order my pentassa and used to order my entocort (do not take anymore) from Jan Drugs in Winnipeg. They had the best price when I looked 6 months ago. They are 100% legit and my friend installed their accounting system.
A couple of things to note
1) Jan Drugs is not the only legit operator out there, but they are the only one I have used, so they are the only one I can talk to personal experience with
2) If you need Entocort, make sure to ask for the Canadian Entocort. It will 10 or 15 bucks more than the internationally sourced, but I called the Canadian drug distributor and they confirmed it is 100% the same as the US version. The internationally sourced drugs might be the same but I did not do this research.
3) Pentassa is not the same. The only place in the world to buy US pentassa is in the US. The Canadian pentassa does not have the same delivery system. However, it is so much cheaper I have been using the Canadian pentassa for the last 12 months. The drug is the same and it works for me
4) Ask for free shipping. It will save you 10 or 15 bucks
5) If you tell them you were refereed by me, it will save you another 10 or 15 bucks. My name is D Fenton
6) I think I paid about 175 per month for entocort and because I am on such a low dose of pentassa much less, (about 50 bucks per month)
7) it takes about 10 days for the meds to get to Atlanta
Do not be uptight re this. I have made this recommendation to others here. They have used this and have had the same experience as me. I would 100% go for it. I can see no reason to buy in the US.
One more thing, if you decide to go this route and if you decide to buy from Jan or another Candian pharmacy, please post your experince, so others can get more information. We are here to support each other 
Dave