I have 2 550Bs. I bought one from Dillon directly, and late last year I bought the second one from Brian Enos.
Brian Enos has free shipping on orders over $400 which is real easy to reach. The press alone is over $400 nowadays.
"Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves." William Pitt, speech to the House of Commons, [Nov. 18, 1783]