Indie Gala has a few nice bundles at the moment. All donation bundles starting at $0.99 and only costing around $4 to obtain everything in each bundle. Well worth it.

Theatre of War bundle:

http://www.indiegala.com/

This is the current main one on office, containing all 3 games in the Theatre of War series, plus all of the second game's expansions. All for $4.70 if you want them all.

The Magic 10 Bundle:

http://store.indiegala.com/index.php...10-bundle.html

Some nice games included here.

The Tropico Bundle:

http://store.indiegala.com/index.php...co-bundle.html

Including the 1st, 3rd and 4th games in the series.

The Patrician Bundle:

http://store.indiegala.com/index.php...an-bundle.html

As well as Patrician IV and Patricians and Merchants, this bundle also gives you Darkstar One and The Great Art Race.

The Dungeons Bundle:

http://store.indiegala.com/index.php...ns-bundle.html

Containing Dungeons: The Dark Load and Dungeons: steam Special Edition.

The Sacred Disciples Bundle:

http://store.indiegala.com/index.php...s2-bundle.html

This contains Sacred Gold, as well as Disciples II: Gallean's Return and Disciples II: Rise of the Elves.