as many of the highest watt CFLs that you can find would be probably be the cheapest/easiest way. 6400k for veg, 2700k for flowering. higher watts for flowering if you can get them.
or you might be lucky and find a small HPS floodlight for around $50. combine that with a few CFLs and youll get some good bud.
you can use a few CFLs to start with for the first few weeks then just add another each week to spread the costs. buy larger CFLs each time if you can.
id really recommend you try and get a HPS for flowering with tho, if you can afford it and arent trying to grow in a tiny box that is.
HTG have a 150w setup for $70, have a look and see if theres anything comparable locally. the cost of the lights will be easily covered by the first grow.