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Handpicked Most Valuable Vintage Tech Products That You Can Buy Today. Texas Instruments Speak & Spell: $50 to $100 ( Rs 3,483 to Rs 3,483 ) Back in 1970s, this was a children toy that was made to help them learn to spell. The toy had an early voice synthesizer and ask children to spell out the spelling of words. After doing our research, Speak & Spells can go for $50 and $100 on eBay the ...