Where is the best place to buy a high pressure propane regulator for a 500 gallon tank?

Lifestyles propane on West 11th they got somebody there who knows what they're doing I've had very good dealings with those folks

Cabelas has em but go to propane place .where they have the big tanks and you will pay a little more but it is worth it.Are you in the Eugene area ? Because I don't know the name of the propane place there.or just Google it.