OK, here's a thought: Why doesn't somebody associated with OFF open an eBay store or eBay account to sell OFF? It's cheap and it's easy to get set up! You could even create a seller ID that was related to what is used now. eBay now requires PayPal payments for almost everything, so no checks, cash, money orders to handle. PayPal is world-wide, does currency conversions, allows use of all major credit cards, issues single use credit card numbers for those paranoid about providing their actual numbers on line, and offers buyer protection. Postage can be calculated and the labels printed from their site. Monies go into an interest bearing account and can be transferred to a bank on-line. It's world-wide exposure for a pittance! It's probably the #1 place people go to find a copy of CFS3, anyway. That's where I got mine. If, at some point, this generates enough interest and sales of the product, there's a ready made vehicle to add other things likes posters, T-shirts, hats, etc. I don't know what the long range business plan is for you folks, but you damn sure deserve some measure of success in the monetary sense for what you've created. The facts are there are few WWI sims out there and few of those are worth a crap. The trend in PC gaming is realism, realistic physics models, super graphics, immersion, and everything else you offer in spades! if you try it for a few months and it doesn't create any extra sales, close it. The investment will have been very small.
If someone is interested there are ebay fee calculators to be found a-plenty. I popped in $49.99 cost, plus $9 S/H and the fees came out to $2.06 for eBay and $2.01 for PayPal's cut.