What bike are you riding?
There are a few things you can do yourself and save money:
- Oil and Oil filter change
- Chain tighten
- Chain clean and lube
- Pump your tires
- Check your fluids (brake and coolant)
Chain cleaning and lubing is pretty straight forward. If you have a rear stand, it'll make things go much faster, else you'll have to wheel the bike forward and back to access all of the chain. (Never do chain clean/lube with your bike on!)
Instead of me explaining, watch this video:
http://www.youtube.com/watch?v=P-5_JbLx2Bw
Skip to the end if you only want to see how to lube the chain.