Accepting a single bundled price
One lump-sum number hides where the margin sits — often a meaningful hardware markup on a single device. Insist on separate lines for device, labour, electrical work and network work. Vendors who quote in lines are also, reliably, the ones who have thought the job through.
Taking the lowest quote at face value
A quote far under the field almost always excludes something the job will need: the mesh node, the power point, the second visit. Ask directly what is excluded and what discovered work costs. A realistic middle quote with clear lines nearly always ends up cheaper than the lowball plus its surprises.
Ignoring running costs at purchase time
Camera cloud subscriptions, hub-locked ecosystems and battery replacement schedules are the quiet second invoice. Over three years, subscriptions on a few cameras can outgrow the original install bill. Favour local storage where it fits your needs, and standardise on one ecosystem before the third device, not after the tenth.