Shop for Fitness drinks/powders

Greetings readers,

I am preparing to start the P90x fitness program. Unfortunately, due to FDA restrictions, they (Beachbody) apparently cannot export to me the accompanying protein powder and recovery drink. I've printed off the ingredients to be able to search for equivalents, but I've no idea where to look. Is there a shop that sells a variety of such fitness drinks/powders where I can go along and choose an appropriate substitute?

And if anyone is doing/has done the P90x program, I'd love to hear from you! I'll be starting mine mid-September (after the Jillian Michael's 30 day shred program).

Thanks for reading!