there was a lot of them available about a year ago, but i havent seen that many go up for sale recently. the 3rd gen badger attack is generally one of the ones thats most readily available in the sale forums.
in general they are fairly scarce, in that there is no where to purchase them from like a store. your basically left with watching the exchange board here at bladeforums, ebay, and whatever other knife forums you visit
you could also try putting up a post in the "wanted to buy" section here, as well as the trade section if you have some knives you'd be willing to trade for it.
busse combat has a new production protocol that calls for a limited amount of models to be made at any given time, and to rotate through the line as the year (or years) progress. by making only 1 or 2 models at a time it allows them to keep up with orders and get them out in a timely manner (within 3 months of the sale page for that model having been taken down). previous production where all models were available at all times proved to be less then ideal, and wait times were much longer then they are now.
the tactical badger attack (the new one with the tac handle) will probably be coming out within the next couple of rotations, since it hasnt been introduced yet. that being said the battle mistress is coming up soon, wich may be up for sale for several months, so it may be a few months until its actually available for purchase, and then there is the actual production wait.
http://www.bussecompanystore.com/
the company store has several models in stock for immediate purchase, that will be shipped to you roughly at the time you purchase it (i've found that blades from scott generlly arive within 1 weeks times, shipped usps priority). but even the company store occasionally runs out of highly desired models, such as the current heavy heart.
you best bet, if not the company store or waiting for the new one to come out is to watch the sale boards, and put up a thread in the wtb/trade section.