If you have poor self-control, Amazon is not for you. I work with a guy who literally buys something every single day from Amazon, Woot, or somewhere else just for the thrill of opening the package midway through the day to see what he got. They make it so easy and effortless to buy things but sometimes it's a little too easy.
I myself have been a happy customer for years. But I try to restrict my purchases to things I actually need. Some things on Amazon cost far less than what I can get them for locally, some things I can't even buy locally. On rare occasion I'll buy something from Amazon just because I know that if I have any problem with it whatsoever, I can send it back and they'll credit my account with zero fuss. Amazon is also great for researching purchases as well. Computer monitor blow up? Need a new one? Even if you don't buy it from Amazon, it's a great way to narrow your selection based on specifications and reviews.
I'm also a huge fan of
http://camelcamelcamel.com/ for setting price watch alerts on things that I'll need in the future but don't have to have right away. (And also for the pretty graphs which tell me if I'm paying too much for something.)
Some things I've purchased recently:
- Toner refill kit for my printer for $6 (replacement toner cartridge is $40)
- Cordless drill and impact driver set (on sale for $90, stores around here have them for $120+)
- AmazonBasics AA rechargeable batteries (8-pack, $16, can be recharged thousands of times)
- New sump pump for basement ($130, cheaper than the crap pumps they sell locally and far better made)
- Misc tools and supplies that would take me forever to track down locally.
Many things do cost more on Amazon than if bought locally, so you do have to watch carefully. I never buy something unless I'm pretty sure I need it. If I'm not sure, I save it to my wish list and decide later. (Usually, the things that end up in my wish list are never actually purchased.)
amazon.com really jacks their prices up right before Christmas. Check again after the holidays and you might find better deals.
I've observed quite the opposite, lots of stuff is cheaper around the holidays, albeit not by a huge margin. Every item is of course different but in general I've found that things which have a semi-stable price over time (e.g., not consumer electronics) tend to dip right before the end of the year and then rise dramatically in January. I see the same pattern in our grocery stores as well.