Bi fold doors

[kerala]

About to buy 2 sets 3 and 4 leaf. Big spend and suddenly got cold feet about buying such a large item online without seeing. We want timber frame and need to be as warm as possible. Dh wants triple glazed but I wonder if the extra is worth it. Anyone bought these recently?

Sorry - can't offer any advice but I'm bumping because we will soon be in the same position and I'd love to hear from others too. Would you mind sharing a rough cost of what you've found so far? I keep finding prices very difficult to get hold of.....

There's a large thread on page 2 which may have some info (I haven't read it all).
Papa, we were quoted £6000 for coated aluminium bi folds to span an 18ft opening by our builder, if that's any help?

Just seen the other thread thanks ohnoyou