I was going to order one S1 on Friday when my 0.5 BTC becomes available from my bank transfer. But this morning I saw that the minimum quantity is now 2 units. I won't be able to order it unless I add more bitcoins to my account, and that'll take another 5 business days. ARRGGGHH!!!
If you are in the US, you can use snapswap.us to add USD and use your ripple wallet to buy BTC for 0.9% + $0.30. https://b2r.uservoice.com/knowledgebase/articles/344740-how-to-buy-bitcoins-using-ripple-wallet-and-snapsw. It takes about two days.