Heeeey, i suggest a pc grow. Its a great idea IMO. All you need to do is get some reflective material to keep all the light on your plant, around a 100 watt of cfl( more is better tho), intake and outtake fans(use pc fans), soil and nutes and thats pretty much it. I recomend an autoflower strain, try Top 69, i had a good experience with it, check out my grow
im also using a pc case to veg 2 plants now. You could probably budget grow with around £60, let me know if you have any other questions mate