Walter White Fancy Dress
There are some great accessories online to make an awesome breaking bad fancy dress costume. Walter White has shaved his head so you need to start off with a bald cap. Walter is sometimes known to wear a distinctive pork pie hat so this is a great accessory.
In the most recent series Walter works in a high tech meth lab. He wears a protective chemical mask and disposable overalls. These are easy to buy online and make a great Breaking Bad costume.
Saul Goodman Fancy Dress
A cheap suit and bad hair wig should be enough to make a convincing Saul Goodman costume.