Uhm, Just so you know BJDBaby is a recast retailer and I can't condone the purchase from them.
But in theory you can generally attach any head to a similar sized body (So 1/4 head on a 1/4 body) But colour matching and proportions is a whole 'nother barrel of fish that's a case by case basis. I definitely can't help you if you intend to buy a recast since I have no idea what colour their resin might end up being.
Most of the sites I can think of will probably be around the same price range as bluefairy but this might help [link]!
But remember, if you really really like the bluefairys then don't settle for something cheaper. You'll just kick yourself later with thoughts like "If only I saved up $50(Or whatever amount) more I could have had the doll I loved!!".
Well none of the Bluefairy dolls should go out of stock anytime soon unless they're one of the limited ones. But the others won't sell out or anything, last time I saw any of the regular line go out of stock was when they were revamping and moving stuff around years ago hah.
Sorry, I don't know you or anything, but I do know dolls and - please don't buy from BJDbaby! They make horrible recast dolls that are illegal and break very easily and can become very dangerous. Please do lots of research before you try to buy dolls as it can be a very risky business.
haha, I used that page as an example. I found a doll I love on doll-love.com [link]. The only thing is, I've send them an email and they haven't replied :S so I'm wondering if the site is still on. Thanks for help, though
Hahah just follow any of the many tutorials on fishtail braids hanging around the internet, no need to do anything fancy for doll hair! I assure you they'd be much better then anything I could do hahahha