Where can you print magic the gathering proxies?

There is a French site where you can print decks in proxies. There are some other sites, just take a look on the internet . But remember, private proxies top cannot be used in tournaments

There are a multitude of site where you can print proxies.

Most sanctioned tournamnets do not allow proxies, but some non-sanctioned tournaments do. Remember to always check with your tournament co-ordinator or the head judge before trying to use proxies.