For 1 8x10 greenhouse as described in the plans/pictures.
Timber (treated western red cedar) all cut to size (because I was feeling lazy) nail plates & delivery cost £75.
Glazing based on the prices
HERE would be £154.14 for
19 x 1.82M 3" Profile 5 Star PVC Clear @ £6.54 each
4x 2.13M 3" Profile 5 Star PVC Clear @ £7.47 each
Shop around & you should be able to find a much better price (closer to £100) at any builder merchants this link is more to show you what you are looking for.
You could also try freecycle or keep an eye out for anywhere that is having a pvc roof replaced. When my local bus station had their workshop roof replaced there were a couple of hundred (used but ok once cleaned) 10' panels available.
Then there are just a few bits & pieces like hinges handles for the windows etc...
One advantage of timber over metal frames is thay you can add bracket shelving internally to use as removable staging.