moomin ah I hate the whole attitude of being 'greatful' we are greatful but it's still ok to moan and be upset.
I used to get this a lot in my first pregancy when I had hypermisser of course the culprits had almost never had bad normal MS never mind anything worse.
Mrs I believe hamandcheese babywears and I thinks few others have too.
I now of NaturalMamas forum it's great for sling knowledge and many of the mothers babywear full time.
Personally I find YouTube the noblest lace for this type of research if you search for Mei Tia, Erog or SSC babywearing, Ring sling, woven wraps, stretchy wraps.
Like anything else it can be as expensive or cheap as you want it to be, I have an Oscha Ring sling but I could have bought cheaper.
Some Brands to search
SSC Ergo, Boba 3G, Connecta
Woven (and Ring slings) Oscha, Didymos, Girasol.
Mei Tia Babyhawk
Stretchy Moby
www.naturalnursery.co.uk/baby-carriers-and-slings.html
www.lovetobenatural.co.uk/baby-carriers/woven-wraps/girasol-wraps.html
This should give you an idea of prices.