You get free shipping on S&S. For most items, there is 5% off for 1-4 "products", and 15% off for 5+ (It's actually by orders. So you can order same product a second time, and it'll count towards that. But if it had a minimum quantity of 2+, that still only counts as one "product". You'd have to do 2x 2 to count as 2 orders). I always choose 6 months for the next delivery, so that gives me plenty of time to cancel the next shipment.
You can modify or change it up to about a week before the shipping date (they'll email remind you about 10 days or so before).
The current price is ONLY for the first order! It can go up (or down) by the time of your next shipment. And any coupons or other discounts from the first order will NOT carry over. You will also need to have 5+ orders to get 15% off again. (Amazon used to change the prices even on the first shipment, I used to have to complain to get a refund. I don't believe they do that anymore.)
Bah weep granah weep nini bong