I hope I can be forgiven for giving another plug to Keep Wargaming but I noticed that they are now selling off their stocks of WWI Minifigs. They sell the figures for considerably below the list price, their postage and packing is the cheapest you are likely to find and their customer service is second to none. They also manage to take very good photos of the figures so you can see exactly what you are getting (which is something the Minifigs/Caliver website doesn’t consistently do). Anyway, it is great value for anyone wanting to get into WWI wargaming in 15mm.
You could email them and see if they will accept other forms of payment. I find them very pleasant to deal with and they have been in the business a long time so they will be used to dealing with non-electronic payment.