Alot of folk fiddlers are using the Baroque style of bow now. These are a bit smaller and lighter than the Tourte bows and are made of Snakewood. I bought mine from a Chinese company called Yitamusic who trade through an Ebay shop. The price depends on the quality of the stick.

The Incredibow is popular round by us as they are sold by Nigel Harmer at Dance of Delight. These are carbon fibre with synthetic hair and are in constant tension. I haven't used one myself so can't give an opinion. (I'll try and borrow one at the Baker's Arms session tonight to see what I think)