I'm in the market for a cheap (like student cheap, <$300 prefferably less) handheld oscilloscope, likely used. It doesn't have to be anything fancy, just something portable that'll give me a waveform and the standard measurements. The ability to connect to a computer would be a huge plus, but is in no way necessary. Even if you can't make a suggestion I'd appreciate any advice on what not to buy as well. Is anything out there such a nightmare that I should avoid at all costs.