I don't think anyone can answer that for you.
There are several popular vendors around, if you look at the reviews from users you'll see what their pros/cons are. Domestic vendors are generally more expensive, most sell by vial and appear to have better reputation, certainly the experience is better but more $$$ for it. Buying overseas, the cost is usually unbeatable, but the experience differs.
Being new, everyone will recommend you do a lot of reading, that you chose the level of comfort you have and send one vial for testing (which increases the cost by $300 and you lose one vial). If you are not sure you'd like to do this yet, the best path you can take is to start with a compounding pharmacy while you figure out if reconstituting your own peptides is something you should be doing.
Best of luck!