STRAPLESS BRAS?!

I need a strapless bra. Needs to be supportive. Needs to not break the bank. Needs to be good quality. Can't be slipping all over the place! I am a 34DD (sometimes I'm a 34D depends on the bra and the level of padding)

Give me some opinions ladies! Name of the bra, website, store name, price, etc. I need this bra for a wedding in two weeks.