OK!
Ittis are £11.59 at Babybots which is the best value I've seen. And Babyots is a MNer.
Cloth Nappy Tree has a great buying and selling forum for preloved but can't get on the site right now. I think I like it best of all.
UK Parents Lounge and The Nappy Site are also good but you'll often find the same stuff there as on CNT as people often list in several places.
The Used Nappy Company is a bit of a clunky auction site with an awful name but can be handy.
Cloth Nappy Addicts is a fun place to chat nappies. You can also buy and sell there BUT you need to have about a million posts before you are allowed to.
LOTS of groups on Facebook, some spin-offs from websites - eg CNT has a FB group.
Incidentally, my DS still fits in a small Itti at seven months and about 15lb. People do try going straight to medium but I think they'd be quite leaky on a small baby cause of the bigger legholes.
I do think of Ittis as gorgeous little posing pouches - I find other nappies last longer but no nappies are more strokeably lovely and petite
If you do go for Ittis, extra inserts are great even if you don't pull out the wet inserts and reuse the outers because the outers dry so much more quickly than the inserts.
This has taken me so long to write someone else has probably beaten me to it!