Are you looking for temporary housing or a permanent setup?
55g tanks aren't a good size for permanent housing for an adult, the tank is too narrow. The red light is not needed and you can get by with a single dome lamp if your home doesn't get cold at night.
If you don't have kid/pets that can access the dragons enclosure you can try a tub set up. Stores like Target sell large storage totes (36x18x20) that can be used as housing. You can pick up a single dome clamp lamp for around $10 at a home improvement store, and halogen light bulb for basking for 2-10$ also. The UVB is never going to be cheep - you can get inexpensive florescent fixtures made for under cabinets at Walmart or Lowes (8-20$) but be mindful they don't have as good of UVB output as a high quality fixture. The best price I have found in reptisun 10 is on amazon.com.