LED could work very well for you, however, LED costs a lot of money up front; you save on the electric and bulb costs in the longer run...but you pay up front and $100 really isn't enough to get you in the game. area51lighting.com for a 2 x 3 space for flower and Hans Panels - bonsaihero.com - for about 2 x 1.5 space There are others but those are excellent and that's about the price one has to pay to buy something good.
I'd be worried about the heat with HPS. Try T5HO lighting. You can get a fixture from Homedepot for $138 and it comes with OK veg tubes. You'll need to purchase flowering lamps when that time comes. You can get better fixtures but this reasonably well and lasts reasonably - I grew with a couple for a year or so...now I'm using LEDs.
For T5 grow remember these things:
1. control canopy top and keep fixture within 2 - 3 inches of the top of the canopy.
2. Keep plant height 3 foot or less.
3. Expect good flowers on what is directly under the fixture and maybe a few inches (2 - 4) to the sides but you basically you want to completely cover the plants with the fixture...which is why 4 tube width is really about as small as you want to go...2 foot maybe but 4 lamps to 8 lamps wide is best....fit your space.
4. You can play with PAR lighting with aquarium lamps if you so desire (flora suns, etc) and it will yield better results but is certainly not necessary.
If you want, you can continue using the CFLs that you have for sidelighting with the T5 fixture if you can't completely cover...but remember CFLs only work for a few inches. Additionally, if you save some money and go LED later, you might wish for some T5 side lighting or want to set up a separate veg and flower area so there will be continuing uses for the fixture.
..but e-bay LED fixtures, no matter how cheap, are typically not worth what they cost.