Star Trek Pizza Cutter at Think Geek for $29.99 would be perfect for the pizza lover on your list.
Star Trek Talking Communicator Keychain at Star Trek Gift Shop for $8.92 would not only keep track of keys, but be a source of entertainment and a conversation piece.
Star Trek Feeding Set at Think Geek for $24.99
Star Trek Bottle Opener at Think Geek for $19.99 for the bottled beer lover that is also Star Trek fanatic
Star Trek Limited Edition Numbered Pez Dispensers at Star Trek Gift Shop for $29.94.
Star Trek Snowglobe at Giftopolis.com for $19.99
If the Trekkie is into bling, this 3D Star Trek Enterprise Necklace at Gifttrek.net for $16.96 would be a good gift.
If you are crafty and/or technically inclined, you can make the following for little to no cost
Instructables has a tutorial by masynmachien to make a Star Trek Comminicator made out of an old mouse
Instructables has instructions by bchafy Build a Star Ship Enterprise out of pens, binder clips and CD