We used these Light Cans ... just over $5. We got all the tracks, T's, and power terminals there too. Many of the lights cans limit you to the size of bulb you can use, usually a PAR30 is the biggest. These cans will hold up to PAR38/40 bulb which is a huge difference in the amount of light output.
On my switching layout I used these Light Cans with halogen 75watt bulbs. I hate that setup. I can only go up to a Par30/R30 bulb and the heat from the halogens is intolerable in the room. I have 12 of them in that room and it's not enough light and way too much heat. That's why we went a different direction with lighting over at my Dad's house, to make sure we had enough light, it wasn't too hot, or suck up a ton of energy.
Anytime someone walks in the room at my Dad's house, usually the 1st comment is... Wow, it's bright in here! There's 30 CFL floodlights in there, and they are dimmable so full bright is when we are working on the layout. Also comes in handy for photography as no other source of lighting is needed for quality pictures in that room.
PAR 30 Halogen vs PAR38 Dimmable CFL
I used the ones on the left, do not like them at all. Very happy with the decision in lighting we used at my Dad's house...no regrets there. Although it was right around $1000 for all the lighting, but the bulbs were $20 each.
