Hundred dollar bills, Hogan! https://www.youtube.com/watch?v=LtyqHfWgwjM
But in all seriousness, it's either cash or money order.
In the past, I would call and ask them how much a job would cost, they would tell me, and then I would mail in the jersey with a paper saying what my order was, along with the payment. Then, I would wait a while, and eventually find a UPS package at my door with a nice styled-up jersey inside.
It'll be more pricey than most other suppliers, and it may take a while to get your order back. But if you want original accuracy, then that's the price you'll have to pay.
I can only answer generally, maybe some Sabres fans can give better information. But from what I have encountered with Buffalo jerseys, it seems that the team uses the same kits that all NHL suppliers get, known as the "NHL/NHLPA" kits (e.g. https://www.stahls.com/official-nhl-player-name-number). It doesn't seem that the Sabres kits have had any "in-house" alterations performed on the artwork in the past. So, my best guess would be that Action Spot or even Exclusive Pro would most likely do just fine in lettering your 05-06 jersey using the default NHL name/number kits.