From the Factory Outlet. You could start with the center for now, and get the surrounds later. Or get the surrounds first and use your Ax5's in phantom mode to simulate the center, and get a center later as budget permits.

Qs4 surround $193 ea
Qs5 surround $243 ea
VP100 center $230

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85