If you can't find it on the Cartel Market, you will need to buy it from the GTN.

Items are regularily rotated in and out of the Cartel Market, so the Corellian Bunker Buster Aurek may or may not actually be for sale on there on any given day. Cartel Coins can be bought with real money, subscribers receive 500 per month, players with a security key earn 100 per month, and you can also earn Cartel Coins through achievements. The Corellian Bunker Buster Aurek may be available for direct purchase from the Cartel Market with Cartel Coins. Buying the Corellian Bunker Buster Aurek Directly from the Cartel Market with Cartel Coins

The price and availability will fluctuate with what other players have to offer, the rarity of the Blaster Cannon, and its desirability. To find the GTN at level 10 or higher, look for the Galactic Trade Network section of the Republic or Imperial Fleet. The Corellian Bunker Buster Aurek can be found on the GTN, which is an auction house where players can buy and sell unbound items. Buying the Corellian Bunker Buster Aurek from the GTN with Credits The Corellian Bunker Buster Aurek is a Cartel Market item, which means it originally comes from the ingame Cartel Market, and can be obtained four different ways - bought on the GTN, bought or traded from another player, bought directly from the Cartel Market for cartel coins, or found by random chance in a Cartel Pack. How to get the Corellian Bunker Buster Aurek

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