A cheaper alternative to a full length track and track saw is a builders straightedge (sorry if that is not the correct term). My 3 meter one was less than £20 and I've used it both to just run a regular circular saw along and as a guide to slide my 1400 mm track for my track saw along on longer cuts.
I'm in Denmark, so a specific recommendation is probably useless. I'm not even sure I used the right term, but it's the straightedges used by pavers(?).
A cheaper alternative to a full length track and track saw is a builders straightedge (sorry if that is not the correct term). My 3 meter one was less than £20 and I've used it both to just run a regular circular saw along and as a guide to slide my 1400 mm track for my track saw along on longer cuts.