I watched for deals on ebay and got a Tek2215 and Tek2340A for like $120 and $200
There's lots of nice scope for under $200, I didn't want to get a 20Mhz scope, there are 60MHz and 200MHz
But a 20MHz can do a lot, I have $20 DSO138 scope, 200kHz, but its battery powered or wallpack, works great for lots of low freq stuff where u don't need the accuracy of a "real" scope.