Starting at £49 reduced to £24.50 for the Red Lace Short Dress*there are seven dresses for under £30, and an additional 18 dresses for under £50. They're quite a unique style and look too, and you are highly unlikely to run into someone else wearing the same thing.
Aftershock sizes are from small to extra large, which gives you UK 8 - 16 sizes, a pretty decent range for a boutique brand.
Pop your purchase(s) into your basket and check out, and you'll find all your discounts already applied.
Shipping takes 2 - 3 days, so it's a bit late for a something special for Valentine's day, unless you choose Next Working Day for £5.95.