I started out with a "rocker" style tool post.? It work but would often catch the bit and move it off center.? When I managed to get one of the 4 sided posts, I thot it was a wonder.? But after a while, it got very tiresome to put a bit in and shim it to the right height, and for each bit having to do this. Putting "4" bits in at once usually did not work.
When I managed to get hold of the Aloris style tool post I was simply amazed at how well it work, how easy it was to change a tool--and it was pre-set to the right height.? The only problem was having a separate holder for each tool.??
Well . . . .? There is a solution--you can make one.? Or you could buy a cheapo Chinese one.? That's what I would do.? Look into Shars in the USA, but you were talking Lbs not USD so most likely your are in Britain.? I'm sure there must be a cheapo sales company in Britain.? If it were me, and I had access to milling capability, I would make one--lots of fun to make your own tools.? After all, that's what machining is:? Making a tool to make a tool to make a final piece.? Done it many times.
I bought a bundle of the slide on tool holders but as every machinist knows, you never have enough tools, so I will get around to making more.? I have a good supply of the right type of steel for making the holders.