Tweak Sez: You can Browse the whole store by Price here.  Just try that in the real world!

Sony Acid Music Studio Loop Software (Windows) If you're serious about making your own music, ACID Music Studio software is the perfect tool for original song creation, multi-track audio and MIDI recording, and studio-quality mixing, and effects processing. Share your songs any way you want -- burn your own CDs, upload to the web, prepare audio for podcasts, or export to your MP3 player. With built-in tutorials to guide you, you'll be composing, mixing, and mastering like a pro in no time.
Priced from 69.95

Ableton Live Intro Production Software (Mac and Windows) Ableton Live Intro gives you the essentials of Ableton Live at a great price. Whether you're a talented newcomer or a seasoned professional, Live Intro has got what you need for writing songs, making beats, recording, remixing, DJing and performing your music live on stage.
Priced from 99.00

Cakewalk Software Guitar Tracks Pro (Windows) Designed for guitarists and singer-songwriters, Guitar Tracks Pro 4 is the recording solution that takes your music from riff to hit. You get an amazing virtual guitar amp, a backing band of virtual instruments, precise editing tools, mixing console, effects, more--for less than a few hours in the studio.
Priced from 99.00

Cakewalk SONAR Home Studio (Windows) Sonar Home Studio 7 is the easiest way to turn your PC into a full-fledged music production studio. From start to finish, Sonar Home Studio will help you capture your creativity and share it with the world. With Sonar Home Studio you can record live instruments, vocals, or any audio source. You can easily edit audio, MIDI, and music notation. The updated Loop Explorer gives you the tools to build backing tracks faster than ever.
Priced from 99.00

Steinberg Sequel Music Creation and Performance Software (Macintosh and Windows) Sequel 2 offers you so many more new ways to produce your songs - but is just as accessible and easy to use as the first version! With the new Controller Mode you can control nearly all Sequel 2 functions with an external keyboard or hardware controller. So you can adjust the track volume with an external controller or you can mute a track with your keyboard. With the MIDI Learn function the allocation of the parameters is so easy: just click a parameter in Sequel 2 and move the desired knob, slider, key or button on your hardware. Now you can control the function with your external hardware.
Priced from 99.99