Victorinox has locking blades. It's what I have, and it's worked for me for over a decade.
With cutlery and tools, unless someone is going out of business, you get what you pay for. The good stuff will last a lifetime and then some.
Before considering price, you should at least look at the different tools that come with a multi-tool. Consider your needs because there is a lot of variation. Some of the unique ones that I've noticed are that mine has wire stripper/cutter, micro screwdriver, a blade for punching leather and whittling points into sticks as well as another chisel type blade. SOG multi tools usually come with an implement for crimping blasting caps.
Even if you go with a trusted brand, if you see a new one selling consistently for a really really low price, you may as well expect to buy it 2 or 3 times again later on.
