So far as of today (8/22), PurchasePeptides, GreatWhitePeptides, and PinnaclePeptides seem to have the best sales/discounts.
----------------------------------
PurchasePeptides (8/22)
Buy 1 get 1 FREE liquids continues (NO PROMO CODES) at Purchasepeptides. Plus earn 35% OFF all peptides excluding bulk items by using promo code well at check out.
HardcorePeptides (on going)
25% off first order. Free shipping on orders over $300
EvolutionPeptides (on going)
Free shipping on orders over $250
ExtremePeptides (on going)
25% off first order. Free shipping on $199 or higher. Canadian domestic branch as well.
Sign up for member only sales and to receive bonus points on purchases.
BlueSkyPeptides (on going)
Daily Deal features one item deeply discounted. Loyalty rewards
GreatWhitePeptide (8/21)
40% off products. 72 hours only. Started on 8/21
Discount code: GWP40
72 HOUR SALE!
CEMpeptides
(I don't see any sales or specials listed on their site and haven't gotten an email from them in a while)
PinnaclePeptides (on going)
25% off first order. Free shipping on orders over $50.
35% off storewide for EF board members. Or you can just use the code EF35 for the same discount.
***not sure if you can combine the 35% off discount code with the 25% off first order discount. If so, that would be 60% off. ***
IronPeptides (on going)
Free Shipping on $150 or more orders.
SuperiorPeptides (on going)
Free Shipping on $200 or more
25% off one time only coupon