> It costs plenty of money.
Not for the entry level. The Icestorm [1] tools are free software, in every sense of the word, and can take you all the way from Verilog source (or VHDL using GHDL's analyser [2]) to a bitstream. An associated board, such as an iCEstick or iCE40-HX8K, costs $40 downwards. (Cheap enough that a friendly sales rep. gave me one for free on request.)