Question about online pharmacies and other options

I'm pretty new at this. I've met a couple a few weeks back who had mentioned about this medication phentermine. I want to consult to my doctor about this medication for weight loss. I have tried a few different things in the past and have had 0 results. I've consulted with a nutritionist for a balanced diet. I can hardly follow it. I always forget to. I've gone to the gym for 3 months, did not lose any weight. Hard to believe I didn't. I did the trend mill for 30 mins, elliptic machine 30 mins and spinning for 30 mins.. all cardio work outs and nothing. Last result was to try out a medication, I went on the herbal life I lost a bit of weight but gaining right back easily. 

What my friends said I should do is go to a doctor to inform me about phentermine, maybe prescribe it. After taking the medication assist the nutritionist once more to continue with the balanced diet to maintain the weight loss and maybe continue going to the gym to stay fit.

This all sounds great, but I wanted to do a bit of some research first on phentermine since I've never taken it. Found this forum and thought I would ask.

I have no insurance so my consult fee would be about $70. The medication I don't know how much it would cost me. But my friend said that if I needed to If the doctor agrees and explains to me how phentermine works I can easily buy it from a online pharmacy.

I've researched for online pharmacies and boy I don't know what to believe or go with. one place says they are legit other says they aren't. Now this is just feedback I find from places. And some online places just don't have any feedback at all. 

I came across one in a topix forum, where they talked about a meds-xpress.com. They offer phentermine atleast 30p at $150. Very few people have talked good about the place and accept credit cards, while the others I've googled accept money orders or cashier checks and others just want me to send the money to people first and then expect them to send the product to me. 

If someone has had any experience with this if they can share it please or assist me or give me ideas of things that I can do about this. I know that if I go to my doctor, and he says I am capable of taking the medication, I would like to use a place where I can use my credit card in case something goes wrong I can get my money back from my bank with a dispute about the service and stuff. But would Appreciate if someone can provide me their two cents.

Thanks