Here are some links we recommend:

For leotards:

http://www.gymnasticsolutions.com/

http://www.gkelite.com/Index.aspx

https://www.aerialsbyalphafactor.com/

http://www.dreamleos.com/

For equipment:

http://www.gymsupply.com/

For news and information:

http://www.intlgymnast.com/