An acoustic type bridge is going to be by far the cheapest option - but it's not easily adjustable.
You can get items such as the Graphtec Ghost system
http://www.graphtech.com/products/brands/ghost with Fender bridge type saddles that will fit in a hardtail bridge. But the saddles and pre-amp are quite expensive. StewMac seems to do them quite cheaply (compared to the UK) but then there's the postage.
I'm halfway (well probably only a quarter-way) through fitting some to a Telecaster for a friend.