You can still pick up batteries that will work with all the stock electrics and if you stay with nicads I think it was it should e pretty cheep.
Then on the other hand you could go all out and modernise them with brushless setups and lipo battery's for extra power and run times.
The old Tamiyas can fetch pretty good money on eBay if you wanted to sell up and invest in somthing new. Search the completed listings in eBay and you'll get a good idea of worth, Imo the Escort will be the most sort after out of the ones you have they can go for a lot.
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