You can buy 1000 Burst on three exchanges now:

Poloniex: https://poloniex.com/exchange#btc_burst
Bittrex: https://bittrex.com/Market/?MarketName=BTC-BURST
C-Cex: https://c-cex.com/?p=burst-btc

A short description of each:
https://web.burst-team.us:449/index.php/exchanges/

Or you can trade with a user here on the forum of course.