Keeping the price "limited" to under $100 isn't saying much... Most keyboards are much less than that. If the $20 one from radio shack gives you what you need in a keyboard, I say get it. If you want something a bit different or flashy then....
Logitech has many great keyboard/mice combos (MX Series). If your into gaming, thier
G15 keyboard is $70 and has 3 banks of 18 macro keys, a programmable LCD display, and a few other toys which make it a great choice.
There is also the
Z-Board. This has a base that you can get alternate snap-in keysets for particular games and programs such as WoW, EQ, CounterStrike, Photoshop, and verious 3D art programs.
There is also the Optimus LED keyboard that consists of keys made from LEDs. SO you can project any image on those keys you want. Now that may actually cross over the $100 mark your looking at though.
Ok, going off topic now because this keyboard is about $210, but pretty cool... The
projector keyboard (also found at
www.iwantoneofthose.com is a small device that projects a laser representation of a QWERTY board on any surface and sends your "key"strokes to a mobile device via BT. Yes, I know that's not what you asked about and I know many people knew about it. But I still would like to try one out...but I digress.
Some options you may want to consider...
Black Wired Keyboard - $8.50
Grey Wired Keyboard - $5.25
2-Tone Wired Keyboard - $5.25
2-Tone Wired Keyboard - $24.99
Black Wired Keyboard - $29.99
Black Wired Keyboard - $10.80
Silver/Black Keyboard - $18.99
Wired Eclipse Keyboard - $46.95
My preference is the Logitech G15 board because I like toys with LCDs on them. It's just in my blood. Like a parrot repeating myself, if the $20 one does what you need it to and you don't need an LCD, glowing keys, or a laser keyboard it looks like you have your answer.