Milwaukee M18 FUEL 18V Lithium-Ion Cordless Brushless 6-1/2 in. Plunge Cut Track Saw (Tool-Only) – Home depot hack $285.31

Not going to be for everyone. But, if you’ve already got a compatible track system and are in the M18 system, it is the cheapest I remember seeing.
https://www.homedepot.com/p/Milwa…/315442335
Base saw is $399 select the 55" track and clamps free ($113.69 line item/return value) = Net cost for saw of $285.31