RASA currently has a 15% off promo code at the top of this page, and that takes 15% off your online coffee purchase when you enter the checkout code. The 15% code is best if you want a one time saving on a single order; the subscription deal takes 20% off but applies only to subscribers.
Small one off orders (low spend, single bag or two): Use the 15% off voucher above at checkout. On a $30 order, for example, the 15% code takes $4.50 off, leaving $25.50. A subscription does not help here unless you are ready to sign up for recurring deliveries and want to commit.
Medium one off orders (multiple bags or a larger cart): Still try the 15% off voucher above first, because it applies to a single purchase with no sign up. On a $100 order, the 15% code takes $15 off, leaving $85. If you plan to buy repeatedly and will keep receiving product, compare that $15 immediate saving with the subscription offer below.
High one off orders or bulk buys: The 15% off voucher above remains the straightforward choice for a single purchase. On a $250 order, the 15% code takes $37.50 off, leaving $212.50. A subscription would give 20% off only if you enroll, which may be worth it if you expect to keep ordering on a schedule.
If you intend to subscribe for recurring deliveries: Choose the 20% off subscription offer. It requires signing up for a subscription and is valid for subscribers only, so it does not apply to a one time checkout. For a recurring $50 subscription item, the 20% subscription discount takes $10 off each subscription charge, leaving $40 per charge.
Buying from a sale or limited stock: The 15% code is available while stock lasts and must be entered at checkout. The subscription 20% is subject to availability and applies only after you become a subscriber. If a sale price is already reduced, both percentages apply only if the site allows stacking; the 15% code description does not state exclusions beyond stock, and the subscription deal is for subscribers only, so check the site at checkout for stacking rules.
Choose the option that leaves the lower total for the same items: use the 15% off voucher above for single orders and one time carts, and take the 20% off subscription if you are signing up for ongoing deliveries. There is no on page term here that says the two offers combine, so treat them as separate choices rather than stackable.