The cheapest way to fly is to use a couple of flash units .. Vivitar 283 or 285's - or something like those - with slave triggers.

I am not a fan of monoblocks for a number of reasons.. they are heavier than the flash units cabled to power packs, and every ounce counts when they are on the end of a boom. Monos are far more difficult to adjust when they are buried in a softbox ... unless one uses something like the White Lightning Remote Controller.

I love my DynaLites... Light, compact and surprisingly powerful ... built-in slave sensors...