Several, including Port Jarvis NY, and those on the cable cars of San Francisco.
There are to many types to count, there are usb turntables,dj turntables, laser turntables and classic turntables.
Any old turntables or used ones are good. It will get pretty beaten up. Have extra needles handy.
You should consider if they have standard audio outputs, automatic play feature, the tone arms are already assembled, a built-in amplifier, it is compatible with the operating system being used.
Turntables are available at almost any electronic store. The most popular places to buy turntables right now are BestBuy, Amazon, and Ebay.
While there are special scratching turntables, any turntable will do.
turntables were invented around the 1930's but the record player came out more in the 1970's
Denon Turntables are the best rated turntables available on the market.
Most turntables are not difficult to transport, but cannot be used wirelessly.
Ohio
Denon turntables are compatible with all PC's right now.
A collection of turntables can be available many places. One can get a collection online, Best Buy, etc. Best Buy has a wide variety of turntables to choose from.
You should be able to use standard USB turntables, or you can use any converting programs, which support MP3, but most of them do. They are also usually free-ware, so it is easy to get them by downloading.