Bill Kurek , @caladiums4less very kindly set up an ATP-special Promo Code for 15% off at CaladiumBulbs4Less.com. This expires after Feb. 8.

I hope he doesn't mind my copying this from where he posted it:
The thread "ATP Special Promo Code" in Classifieds and Group Buys forum

Bill said:

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I have created a Promo Code for our friends here on All Things Plants
Use Promo Code ATP16-15 when checking out on our website and you will receive 15% Off the Price of products in your shopping cart
Hurray! Promo Code is good through Feb 8th Hurray!

If you have ANY questions or encounter any problems, Please Do Not hesitate to email me at: [email protected]
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Bill has also posted a great deal on COLOSSAL caladium bulbs! $25 plus shipping for 10 bulbs, and he's even letting us mix & match between half a dozen varieties. (He says 10 of these babies just barely fit, like a puzzle, into a regional flat rate box B).