I have one made by Skillz, its ok for warming up you can grab them on ebay for about 40GBP SKLZ Gold Flex Golf Swing Trainer | eBay
the best training tool I have is Tour Rotation Stick | #1 Training Aid In Golf | Used By Tour Pros (trsgolf.co.uk) , which is just great
also this is good, but I...
ebay for all the clubs I have had, with the exception of my putter which was fit by Andy Paisley at Hexham.
I know what specs I need and what works best for me. I've always fancied a set of nice Mizuno's custom fit, but tbh I'd rather spend that sort of money on my kids.