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To answer your topic: The Casio high speed series. No, they’re not as good as a proper dedicated high speed camera but they can be bought for less than 300 bucks. The Sony FS700 will shoot high speed in bursts but the body is about 7000 euros and if you need a proper high speed camera the prices start from 10 thousand and go way up from there.
If you want to render out interlaced from AE you need to choose the correct field from the Field Render pulldown menu in Render Settings. Your job would be really easy with Adobe Media Encoder.