If you’re looking for an OTF that won’t break the bank, check out what Schrade has to offer. The Schrade Viper is a double-edged OTF with single action. You push on the slider to deploy the blade, and release the lock and pull down the slider to retract the blade. (The knife has automatic blade deployment, and manual blade retraction since it has single action.) The Viper also has a glass breaker at the bottom of the handle, and it has a pocket clip.
This OTF is a great one to get if you want an inexpensive everyday carry knife that’s also a lot of fun to use.