Steal it.
No, allow me to correct myself: steal a lot of them.
All the decks in SR are, essentially, decks created for the discerning consumer - of one type or another. Everyone else is right - this is a self-sourced shadowrun, which means the decker needs to do some work on this. Have him start probing into the matrix security on the many manufacturers of the grade of 'deck you want (there are multiple manufacturers for all the 'levels' of decks). Once the matrix security is sussed out, he can figure out who would be the best target for a falsified order.
For the order, he needs to put together a false front - a corporation that looks good right off the bat. He might need to get together with some other hackers, or go to a group (Hacker House!) that creates this sort of thing. Then he rents for a couple weeks a warehouse, gets it dolled up to look like a working, valid place of business. THEN he goes in and hacks an order for six, eight, a dozen decks of the caliber he's going after - one for him, some for the guys who are helping him out on the back end - gets them shipped to his Completely Valid Warehouse, and goes from there. His team plays the manager, the shipping/receiving clerk, the stevedores, whatever is necessary to take receipt of the decks. They hire a local gang - or another shadowrunning team or two, maybe teams associated with the aforementioned hacker 'friends' - to clean themselves up and play some other guys doing shipping drop-offs and pick-ups
In short, they get together with six or eight other shadowrunning teams to pull off a scam that'll net each of their deckers an improved deck, plus each team a deck they can fence. 30% of 345k is over 100k; even 20% is almost 70k. It's a good chunk of work, and it'll take them a month to pull it off, but if they do it right ...