This is the email I got from Kurt. Let me know what yall think.
As we discussed I think the best option would be to offer a flat 'sale price' regardless of the number of buyers. We will handle payment and shipping directly with each customer, if some want to ship them together we can absolutely save them a bunch on the shipping. We can offer the sale of a one week period starting and ending dates we decide. If we end up with more than 6 of the SS135MOD's we are not going to be able to immediately fulfill those orders. We do have 10+ more on order that we will see in the coming weeks and will ship them in the order we receive orders.
SS135MOD: $355 + shipping <<2nd gen
SS170HF: $350 + shipping <<1st gen
Estimated Shipping: $25-35 to western states, $35-50 for eastern states.
The cost is only ~$5 more to ship two to the same place, for example 2 snorkels to Florida would likely be $50 instead of $45 each.
Thanks and let us know how you want to proceed.