Ahhh, I feel your pain.
Had to go to a dedicated plumbing store for mine.
But if you have some left overs, an oven and something to cut PVC with...
Cut pieces of your pipe off that are longer than the diameter.
Cut these pieces with a hacksaw lenghtwise.
With a flat sheet or tray in the oven and preferably a sheet of non stick baking paper you can now heat the cut pipe sections.
A temp of 180 - 200°C should suffice to get the PVC soft enough.
First try to make them unroll.
Then move and turn them until the pipe looks like a flat sheet, more or less at least.
Take them out while still soft and use a dough roller, bottle or similar to really flatten them on a wooden board.
Once cooled and hard cut a disk out to fit tightly into your pipe.
(does not need to be perfect)
Use standard PVC glue and primer as directed on the packs to glue the disks into place.
First one is the hardest, so here is how to cheat:
As you should have a rig for the winding, use it
Place the first dis inside and align it so if you spin the pipe it won't wobble.
Using a brush apply some primer along the joint area, don't soak it though.
Add a bit of glue in tree or four points, only a little bit!
While slowly spinning spread the glue to a really thin layer - it will dry quick...
Make sure the disk won't wobble and let this first bit of glue set.
The second disk will be inserted dry after applying a thicker coat of glue to the disk inside, cover the entire surface as thin as possible but thick enough to fill imperfections.
Push the second disk in and use a rounded pin or similar to push it against the first disk while all is spinning slowly.
You should see a small amount of glue coming out the joint area, wipe it off or spread it out.
Once all is set you can fill the remaining gap with resin for added stability.
A quicker way to cheat is to use a wooden disk.
Cut and sand it for a an easy fit, so leave a gap big enough so you could wrap a single layer of paper around the disk.
Use Chloroprene cement, also named shoe glue, neoprene glue, to make the connection.
Brush the joint area on the wood with some acetone, you want a slight wet look without soaking the wood.
Before it dries apply a coat of the glue and spread it evenly to get full coverage of the wooden joint area.
Prepare the PVC by wiping PVC primer over the joint area.
Before either fully dries press the disk into your pipe.
You only have limited time for adjustments and I find it beneficial to just place the disk on a non stick surface and then to slide the pipe over.
For bigger ones secure the disk with a screw for added stability but please through whatever it rests on into the bottom and not from the top as you need a bloody long screwdriver to get it out
