Floor Covering: Bought it at costco - $169 for a 7.5x11 foot roll. Lights were purchased at home depot - I forget the price but they are nothing special - basic shop lights. For detailing I use your usual halogens and incandescent work lights.
The floor pads are NOT stuck to the concrete - and for a reason. I can easily remove them if there is a moisture issue, and for periodic cleaning. They are VERY easy to work with as they are a nice soft, flexible rubber. They can be glued down, but I don't see the benefit. As I won't be driving the car in the winter, slush/mess isn't an issue for me. Even if it were, you could just pull them out in the spring and give them a good cleaning.
The cabinets are NOT expensive relative to the cost of "gladiator garage" and other brands. I think total I paid around $650 for the cabinetry. I put it together myself, and it wasn't a hassle - total work time of about 3 hours.
All the stuff in the before photos wasn't mine - it was the previous owners. I took that picture the day we made an offer on the house. You can see the disrepair that the garage was in.
Total cost of the renovation was about $1500 (cabinets, paint, flooring, lights) and alot of time spent cleaning and rewiring. The "stuff" in the garage NOW is all stuff I had before buying the house.