I know it sounds silly but my FH and i made a quick STD event on Facebook as a lot of our friends and OOT family has facebook. Which also helps get everyones address you need all at once. Something they will have a reminder of until the invitations are sent, which we got from vista print. 150 invitations for $85.00
No STDs and we did Shutterfly because I got several coupons and they always have promotions and discounts going on. A lot of wedding websites will give you promo codes for Shutterfly if you sign up for their newsletter, I made an email account specifically just for wedding stuff so that it doesn't clog up my normal email.