Rigol DS1054Z Digital Oscilloscopes - Bandwidth: 50 MHz, Channels: 4 Serial Decode Included: Amazon.com: Industrial & Scientific
The case for buying a used oscilloscope
Tektronix TDS694C Oscilloscope Four Channel Digital Real-Time Oscilloscope used | eBay
Allan Alcorn and Steve Wozniak: Tektronix 465 Oscilloscope Used to Design the Pong Video Game and the Apple II Computer | Sold for $12,500 | RR Auction