Leatherman Style PS Multi-tool - $25. This little guy rides in my coin pocket and has been more useful than any other thing I've carried on a daily basis. Scissors, pliers, bottle opener, tweezers, screwdriver. Amazing little thing.
E-3lue Cobra mouse ~$10. OMG one of my best purchases for work. They supplied a shitty dell mouse. This looks neat, has forward and back buttons (which are a godsend) and is amazingly well built for the price.
Gatoraid Squeeze bottles ~$10. Just super efficient. One is in my gym bag and the other is on my nightstand. Impossible to spill at night when you just need a small sip of water. Also cat-proof.
Iron Lace Boot Laces ~$14. Okay so if you have boots and you have cats, you may have realized that they will fucking destroy your laces. Have had these laces for over a year, and cats chew on them every day. They're still 100% intact and functional. Color has faded a bit, but I love these laces.