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I think the cheapest way of getting a lascanon is just to get a little 25 point tarantula gun emplacement.

For guard 35 point scout sentinel.

inquisition would be a monkey with 2 acolytes so a total of what, 43 points.

The problem with marines is that you have to buy a unit around it. Going to be far more expensive than the cheapest.

HWT lascannons in platoon. 5-12 lascannons with ignore cover order and divination buff. Or maybe 3 rapiers if FW is allowed.
Best non-existing unit is AA mounted on Chimera chassis twin lascannons (2 twin linked), with normal shooting at ground targets + targeter system.