There are plenty of deals on eBay on both Analog and Digital scopes. Here are just a few things to keep in mind:
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Digital scopes are (almost) impossible to service yourself. There are three main components: front-end amplifier, a/d, and memory controller. These are almost always proprietary components. If anything on the acquisition board fails, you probably won't be able to repair it.
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Analog scopes are going to be older, but could still be possible to service yourself.
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Most used scopes do not come with any sort of probes.
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If this is your only oscilloscope, avoid the "Pocket DSO." Their $99 price is attractive, but if it is your only scope you may be disappointed.
Lastly, just fuel the flamewar, I am a proponent of digital scopes. (However, my bias is skewed. I've worked for 2 of the 3 biggest scope companies, so I can do things with them most people can't.)