Thanks bells!!It's going to cost $5.95 for shipping regardless of whether you buy 1 screw or 2 boxes of 100 screws each, but the screws themselves are dirt cheap here:
Metric machine screws, Phillips pan head, Stainless steel 18-8, 2mm x 0.4mm - Bolt Depot
The Taifun uses one of those screws in 20 mm length for the positive post and one that's 14 mm in length for the negative post, assuming that the SmokerStore link shows the correct sizes. The 20 mm screws are $0.08 each or $5.18 for 100, and the 14 mm screws are $0.06 each or $3.72 for 100.