Calvin, the cheapest stuff is noisy, funky, and won't meet the specs they tell you about. But a dual channel with signal generation and multimeter is under USD80 (The Zoyi ZT-703S.) And battery-powered, which can be handy. The next step up may be Rigol or a Digilent unit. Both are good quality. But now up around USD300-USD500. Used, consider analog scopes from Tektronix. Or the HP 54645D MSO from HP. If you can afford high sample rates then by all means get one. I really do believe you should buy as much as you can afford to buy. And if you can consider it, then get an MSO.
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