Recently I discovered for myself that our local flea market have many interesting items to offer, and for prices that are very satisfying. For example in the course of last week I acquired old little black and white crt tv for experimenting, just for 3 USD, and, more valuable item, analog oscilloscope with bandwidth of 50 MHz for just 60 USD, which I suppose is a very good bargain. These items are in excellent working condition despite being some 25-30 years old (of Soviet manufacture). These acquisitions will much improve my quest for understanding electronics, I hope. Certainly, the oscilloscope will much help with study of logic gate delays and thus with improvement of gate performance.