Good Source for Mid Century Modern Style Drawer Pulls?  

have you tried
searching your local salvation armies? You may find a shitty vintage dresser there that has hardware that you may like. If the dresser is cheap enough then it may be worth it.

ikea
have you looked at Ikea?

Handles
Have a look at Lee Valley tools. They have a few retro looking knobs and handles, such as the 'Undercut' and 'Creased Bow' series.
http://leevalley.com/

Great resource rosewood!
many thanks, bookmarked.
Aunt Mark
ps I like these.
http://www.leevalley.com/US/Hardware/page.aspx?cat=3,43659&p=41993

casket handles
Attach those to the side of your guest bed and see the reaction they get!

how thoughtful of them
to help coordinate the proper color/species of wood with the correct toned casket hardware. They must be employing an "interior decorator". Simply creepy.
Carry on,
Aunt Mark

Thanks guys!
Since i'm in the bay area, the salvation armies I go to always charges their dressers at least $100 and up and the shitty ones usually don't have nice looking pulls anyway but I guess I can keep checking, you never know. It's a bit difficult to find them cuz I have to find pulls that have a 4" distance from screw hole to screw hole and I always find nice ones I like with different distances.

I did check with Ikea and the...
I did check with Ikea and they actually have a few I like but none with a 4" hole spacing unfortunately.

4" center to center doesn't...
4" center to center doesn't seem to be a typical size, but a couple options I've always like are...
Kohler Jute bar pull
Schwinn Pulls (there's quite a few options that might fit your needs / tastes)
Alno, A960 & A970

Back in the day, we
used a lot of "staples" -- Stanley Wire pulls, much favored by architects. I'm sure someone still makes them, with 3" and 4" centers, at least.
http://www.thehardwarehut.com/collections/epco-wire.php

All these suggestions are gre...
All these suggestions are great but I still see no 4" center to center. It must be a very atypical distance for pulls.

Rejuvenation
Try Rejuvenation in LA California. They do copies of vintage pulls.

Handles
I see quite a few 3 3/4" center modern style handles on the net and also on e-ay. You could fill the original holes with a suitable dowel (even a chopstick!) and re-drill new holes 1/8" to the middle on each side. You might get lucky and the mounting pad area might cover the repair.

4" is one of the most
common sizes. The Stanley Wire suggested above comes in several sizes, including 4 inch hole centers.
You want approx 102 mm for a metric pull . . .
http://www.wwhardware.com/stanley-4484-4-on-center-wire-pull-s4484