Use the coupon code 5FORYOU for another 5% off. (Expired 30 May).
Sizing can be difficult but they are pretty good with returns from my experience, although this may not apply to everything including helmets but gloves, jackets, boots, should be no worries. Safe riding.
Edit: If you spend over $500 you get a $50 voucher. Standard shipping is $9.95 for order under $20, $0 for order $20 & over. Bulky shipping is $29.95.