My DSE Q-1804 cost around Au$700.00 when my dad and I bought it brand new, one thing I'll have to do one day is replace the trimpot (I'm guessing that's what it is) for the trace rotation cause it's getting increasingly hard to adjust.
Been seriously thinking of getting myself a good Digital Scope for a long time, I found that Jaycar Electronics stock a couple of good ones, a 20Mhz one and a 100Mhz one, the 100Mhz one is the more expensive of the two.