A friend of mine has been let down by their friend who's now not coming to Glastonbury, but they booked Boutique camping together with Glastonbury Retreat. Sadly they can't get a refund, but apparently can transfer it to someone else.
I think Glastonbury Retreat is up by Ped Gate B, near Windinglake
I'm not sure of how much they paid, but think it's in the region of a grand for 2 people in a bell tent for the weekend. If you're interested, chuck me a DM, and I'll put you in touch.