Hi,
My makita LS1040 seems to have lost its lock switch. That little plastic button on top of the handle that you need to press before pulling the grip.
I had a look on the web for the part number and dealers.
I found this link on the web in the US for the part Switch Button [411478-6] - $1.43 at eReplacementParts.com
$1.43. OK I though, maybe 3 bucks here, $5 dollars tops.

Went to authorized dealer.
and when the little plastic part came I was asked to hand over $12.
I told them I'd take it with me and didn't need a security guard to deliver it.
They claim that their cost price is $9.69 from makita.

Whats the most expensive part you've needed to get to have a machine working again.
And I mean value for money, not total cost.

Peter